Rear end Question

Im putting in a richmond rite lock in my 8" and the side gears look really worn and need to be replaced. In my manual it only shows 4236 for the part numbers, but i looked online and there are a lot of side gears that include 4236, but there are four other numbers in front of them, all different. What is the right one for a mustang II? Any help is appreciated.
 
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