help with getting right speedo pinion

i have looked around and cant seem to find the right part number and color for a seeedometer pinion shaft, i am changing rear tire on my 73 duster and know i need to change that to get my speedometer to read right, i have a 489- 8.75- 3.55 rear end and i am going to put a 26" tall tire on my car, any help thanks
Author: admin