I am in the process of ordering a front suspension kit for my 66 SS Chevelle and there are a few choices Large Bushings, Regular Bushings, 7/8 Inch Idler Arm or 13/16 Inch Idler Arm.

I measured the diameter of the lower rear of the control arm and the measurement was 1.6275 in.

Do I have the large bushing or the regular bushing?


For the idler arm, the vendor told me that I could determine which I needed by the size of the nut. The nut size that is on the idler arm is ¾ not the 7/8 or 13/16 the vendor said that it should be.

The Part number for the idler arm that I removed from the car is a T43GMC03890699B.

How do I tell which Idler Arm that I have?


Any help will be greatly appreciated.

I am in the process of ordering a front suspension kit for my 66 SS Chevelle and there are a few choices Large Bushings, Regular Bushings, 7/8 Inch Idler Arm or 13/16 Inch Idler Arm.

I measured the diameter of the lower rear of the control arm and the measurement was 1.6275 in.

Do I have the large bushing or the regular bushing?


For the idler arm, the vendor told me that I could determine which I needed by the size of the nut. The nut size that is on the idler arm is ¾ not the 7/8 or 13/16 the vendor said that it should be.

The Part number for the idler arm that I removed from the car is a T43GMC03890699B.

How do I tell which Idler Arm that I have?


Any help will be greatly appreciated.




there is only one set up used on the uppers moog#k5196/lowers k6076:1.35 front bushing &1.65 rear /k5144 1.65 front &1.90 rear/idler arm is#k5142 he is looking it up wrong that info applies to 1964 chevelles!!!! Bob Rizzi/RIZZI'S AUTO PARTS

They arent asking the wrench size, they are talking about thread size.

There is only one set up on the uppers moog#k5196/lowers k6076 :front bushing 1.35 & 1.65 rear/k5144 1.65 front & 1.90 rear/idler arm is # k5142 he is looking it up wrong that info applies to 1964 chevelles !!!!! Bob Rizzi/Rizzi's Auto Parts (66 CHEVELLE/68 CHEVELLE/70 CHEVELLE)