For what its worth the gear boxes on a 60 are different than on a 70. Both are different than the ones used on a 100 and there are 2 versions of that gear box. Before serial number 70,000 and after serial number 70,001. The 108/111/112L and 116 don't have gear boxes as such. As I said before a serial number and pictures would really help. I have no way of knowing what the splines look like on the steering shaft but I know in garden tractors sometimes different steering wheels will interchange. The best I can tell you is you need to experiment and try others but that can get expensive. Roger