Your Kenmore side-by-side refrigerator appears to be 21.x cu ft model, which would be have been rounded up to 22 cu ft. The dimensions will be approximately the same as the current Kenmore 21.4 cu ft models.
In black or white: sears.com/kenmore-4651759-21-cu-ft-side-by-side/p-04651759000P
Stainless steel: sears.com/kenmore-4651753-21-cu-ft-side-by-side/p-04651753000P?rrec=true
If the color you are looking for is out of stock, check back in a couple of days.
All refrigerators: sears.com/appliances-refrigerators/b-1020022?searsTab=true&excludeMarketplace=true
Hope this helps!
NOTE: Because of its age, I had to cross-reference the freezer door gasket to other models that used the same gasket to get the cu ft capacity. I would suggest double checking the width of your fridge in order to confirm the capacity. If the width of your Kenmore is around 33", you do indeed have a 21 or 22 cu ft model. If the width is approx 35.5", then you have a 25 cu ft model.