Help! 96 Z51 - Need to ID Correct Rear Ctl Arms #s

[LT4AUTOXER]

I need to replace the rear control arms on my '96 CE with Z51. Depending on the source, I have come up with two different sets of part numbers that will fit:

#10098146 / 10098147 - All aluminum. Chevy on-line parts suppliers show multiple listings, including "all years" and "up to 1995" for C4s. These typically cost around $35 each.

#17999723 / #17999720 - Chevy descriptions include the later years (maybe '93 up) and a separate line item for "1996". These typically run $85 each. I have not seen a picture of these, but I know there is an arm that appears to be made out of some type of composite material.

My car came with these composite arms, but being that I bought the car used, I can't be certain what part is correct.

Anyone out there know for certain what the correct replacement parts would be?

Thanks in advance for your help.​

 

[toptechx6]

I need to replace the rear control arms on my '96 CE with Z51. Depending on the source, I have come up with two different sets of part numbers that will fit:

#10098146 / 10098147 - All aluminum. Chevy on-line parts suppliers show multiple listings, including "all years" and "up to 1995" for C4s. These typically cost around $35 each.

#17999723 / #17999720 - Chevy descriptions include the later years (maybe '93 up) and a separate line item for "1996". These typically run $85 each. I have not seen a picture of these, but I know there is an arm that appears to be made out of some type of composite material.

My car came with these composite arms, but being that I bought the car used, I can't be certain what part is correct.

Anyone out there know for certain what the correct replacement parts would be?

Thanks in advance for your help.​

My parts CD indicates part numbers 17999720 and 17999723 fit everything from 84 through 96. I believe the other numbers listed are the casting numbers.