I am installing a 915 transaxle from an 85 into my 72. The stub axle is the 4 bolt, 2 dowel style while the transaxle is the six bolt style. I took 3 pairs of driveshafts to the rebuild shop to have them make one good set with a 4 bolt end and 6 bolt on the other end. The shop called back and said my shafts are different lengths. 19 1/8 (486mm) vs. 18 3/4 (476mm). Can someone tell me which ones I should be using. Thanks, Barrett