Single Lower Pulley

Does anyone know if the single lower puller that Year One sells for the 70 - 74 SB Mopar will work on a 68 - 69 Engine. I dont know if the depth of the pulley will be correct. What im doing is the Engine was an A/C Power Steering Engine and the car is a Non P/S non A/C car. So all the pulleys ive got are for A/C P/S . Can I just buy the single lower pulley that Year One sells and will the offsets be close and use my water pump pulley, or do I need to get a new water pump and crank pulley, a matching pair ? This is by the way a 69 engine with the cast iron water pump.

Thanks
Mark