Something doesn't seem right. Maybe the cowl was replaced on a 129 with a 149 or something, because I think the 149 should have the hydraulic lift on it. Someone may have converted it over and changed the rearends out. Before you go, print out a copy of the serial numbers and check it on the rearend of the tractor plate.
http://www.ihcubcadet.com/IHCCFAQ/IH...WORKS%20SN.htm
You can also check the engine tag or decal on top of the shroud if it still has it to see if it is a 12 hp or 14 hp engine. I don't think it could hurt to have a spare tractor on hand for parts as needed especially if you are doing a restoration of a 149. Best of luck!!
Cub Cadet 123