"Chevs of the 40's" shows the SAME part number for 3/4, 1T and 1 1/2 T.
I would think this company would be in the know. Chevs of the 40's is a well known supplier and web site. Bottom line is it gives you opportunity to measure and compare before purchase. You have the orig and O'Reilly's gives the dimensions on the link. No guess work on this.