1991 Dakota 318 TBI Belt Tensioner made of Unobtainium

Could you not change it to a solid pulley and then fabricated spacer to go behind it?

Do you mean to use the Magnum tensioner?

Best I can tell, the Taurus one is a virtual bolt on, so no reason to try and mount the Magnum one. And I think the Magnum one tensions the wrong direction, too. But been awhile so I could have that wrong.