Raco 6357 switch be used to replace Leviton 573 switch

I believe the switch is the same as an X10 switch (WS467). I have interchanged the two in the past. They are also available on ebay.

If you are replacing an existing switch, either replace one wire at a time, or write down the wire colors from the old switch.
or look here: http://www.leviton.com/OA_HTML/LevitonSearchResults.jsp?kw=5634+wiring+diagram&tbon=D

This one does a pretty good job for mounting a switch in a hollow wall and should work fine for a CMU wall. The expanding "wings" work well in securing the box into a hollow wall. To cut the hole I would use a hammer dill with a small bit (~1/4" should do) and drill a series of holes to cut the outline and knock out the hole and use a masonry chisel to clean up the hole.
http://www.homedepot.com/Electrical-Electrical-Boxes-Conduit-Fittings-Boxes-Brackets/Raco/h_d1/N-5yc1vZbohnZ1z115vzZ1z11eryZ18v/R-100197582/h_d2/ProductDisplay?langId=-1&storeId=10051&catalogId=10053
Why can't you surface mount? There are a large number of low profile boxes that do the trick and save you some time if you could get away with surface mounting.

You posted under Leviton rotary dimmer.
Lutron and Leviton have many 3-way dimmer styles, and both make 3-way rotary dimmers.

I remember years ago replacing 3-way switches with dimmers and having same experience as you. One dimmer has to be ON for the other dimmer to dim.

Later I learned when you replace both 3-way switches with dimmers, you buy a control-and-companion dimmer set. One dimmer is main, and it lets you dim from both locations. The two dimmers communicate with each other electronically. Buy these dimmers at lighting store that specializes in fixtures and dimmers. Ask for most experienced salesperson.

I checked to see if rotary dimmers are made in the companion set. And neither Leviton or Lutron show 3-way companion set rotary dimmers.

1) Leviton spec sheet on rotary 3-way dimmers does not show companion dimmer. This indicates that Leviton rotary dimmers don't have capability of communicating with each other.

2) Lutron has image of 3-way rotary dimmers.
Image shows single rotary dimmer in 3-way & 4-way circuit.
This tells me that Lutron does not have companion dimmer for 3-way rotary dimmer.

http://www.leviton.com/OA_HTML/ibeCCtpItmDspRte.jsp?item=4044§ion=10103&minisite=10025
The Leviton page for Leviton 5613 does not have a troubleshoot.
Manual shows simple wiring diagram.
3-way switches will not operate lights if switches are wired incorrectly.
Check your ground wire is connected.
Leviton 5613 series is illuminated.
Check that both switches have 5613 number.
Swap switches and see if problem is inside switch.

The Leviton 6696 Anywhere RF(Radio Frequency) lighting control allows you to add an additional (wireless) switch to an existing switched light(s) without having to hard wire it. For example, let's say that you have a bedroom with a switched overhead light. The Leviton 6696 RF receiver would be installed in place of the existing light switch. It will still function and is wired the same as an ordinary switch. The Leviton 6696 Anywhere RF transmitter (after installing the batteries) can then be used anywhere within 50 feet of the receiver (that replaced the existing light switch) to also control the light. You don't have to mount the transmitter if you don't want too. It can be on the night stand, (or carry it with you if you want) so you can turn the light ON and OFF from the bed or wherever.

The retro-ring 4x4 (#206 Raco) is intended for 4 square boxes. For a 3x2 box you should use Raco 977 box supports: http://www.grainger.com/Grainger/items/3XK12?Pid=search

If you have already committed, you can use a Raco 8787 (flat 4x4 cover):
http://www.hubbellcatalog.com/raco/RACO_datasheet.asp?PN=8787&FAM=RacoBoxes

Hmm .. I cannot seem to find a single plate that will do this .. you could use a sectional .. like these..

In some combination they usually can be worked to cover most any device . They arte available at all electrical supply stores ..

Please Vote !!

If there is an electrical specialty store in your area, i would remove the switch and take it there. They may be able to help in either replacing or rebuilding it. That sort of control is not difficult to recreate, but it is an uncommon feature. A good electronics tech can show you how and get you the parts to do it. i am NOT talking about Radio Shack. i mean a mom and pop shop that specializes in electrical and electronics.

i hope this helps
matthew

I recently purchased a Leviton Dimmer switch which has a brown lead. This switch is to replace 1 of 2, 3 way switches that control the ceiling light in my kitchen. My problem is the new dimmer switch has 4 leads including a brown one which has me confused. I have installed and replaced numerous dimmer switches without difficulty. Please help.