There are two versions, only difference is the clamp bolts are on opposite sides. They were also used on RRC up through 1994, 3.5, 3.9 and 4.2. One on the water pump belt and one on the A/C compressor. The one in the above pic is the one for the A/C. You can swap them, but getting to the clamp bolts can be pretty tight, especially if you use the A/C tensioner on the water pump, the bolt winds up right up against the crank pulley.
I have some, but am just about to head out of town till next week and won't have time to dig them out till I get home. If you still haven't found one by then, let me know.
1991 RRC 4.2, R380, LT230, TrueTrac, Detroit, sliders, 33s, blahblahblah....
1994 RRC LWB
1994 RRC SWB
1995 D90 project