Oldsmobile/Buick Repair: rack and pinion, heavy duty brakes, axle shaft

Question
how do I determine which is the correct part # for my 1997 buick century 3.8.There are 2 numbers
listed.Can you help?.A rack and pinion is the part
Im seeking.

Answer
hi graylin,they want to know if you have heavy duty brakes or std.if your axle shaft has a 36 mm nut on it about the size of a donut.then you have heavy duty brakes.if not the nut will be about the size of a half dollar..or possibly just two different warranties..good luck please rate my help ty billymac