I am looking for a parts manual for a Kenmore stackable washer dryer unit model number 970-C98902-20. Thank you in advance.

Yes, but you normally have to remove the case. In the case of a stackable unit, sometimes you can get in from the back panel.

https://www.google.com/search?q=kenmore+stackable+washer%2Fdryer+417.94702300+replace+water+level+sensor

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Article here

https://www.hunker.com/13410390/how-to-clean-a-kenmore-front-load-washer-filter

Parts schematic

https://www.searspartsdirect.com/model/5120s62858-001781/sears-canada-970-c40042-00-washer-parts

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Most stackers have a frame which goes around the top of the washer and a lip above which the dryer sits on. If you cant get the correct frame, ive seen Customers who sit the dryer on a towel above the machine and then at the back, use a couple of metal straps that have been screwed into the dryer and top of washer using the original screws that hold the backs on both machines.

Searspartsdirect.com.

Could you please post the model number of the unit? It will be under the washer lid, in the dryer door, on the top, or the side of your unit.

stackables are convenient..small but work great.....youll find what you need at lowes or home depot

look under washer lid or inside dryer door

there should be a number on the belt take it to the spares place and they should be able to match one up for you

how do you seperate the stackables for moving