1991 Dakota 318 TBI Belt Tensioner made of Unobtainium

is this a dakota sport? i looked at advance and typed in sport w/318 and it came up as dayco 89434 or litens 910556a. none avail for p/u in store. had to order online. dayco over 100.00 w/o any discount and litens is 77.00 w/o any discount applied. i tried to have napa cross the 89315 and it would not cross. if you call dodge w/ vin they could give you mopar numberand also see if vintage parts had one or any other dealer in country has one. if not then google mopar number and see if any nos supplier has one.

It is a Sport. When I went to the Advance website, and entered a vehicle, it only listed pulleys and no tensioner. I will look at those numbers.