I had a coupler go bad last fall on the left drive axle of a 2188. I replaced the couplers on both sides and got through the season. I need to replace the shaft coming out of the left side of the tranny and the drive axle between the two couplers. I am set up with duals, but cannot remember the length needed. Is there any aftermarket companies that make the parts I am needing or is this OEM parts only? Thanks.