adjustible one just changes the pinion angle. You want this. The torque arm can take stress off the tranny if it's tunnel mounted. Personally I find them to be untolerably noisy and use a tranny mounted one. If you do get an aftermarket torque arm get the longer bolts the vendors sell to go with it.

 

ok so get and adjustabe TA but not the relocation brackets... just attack it to where my old one is now and use longer bolts...

 

Well don't just take my word for it. Many use tunnel mounted TAs and like them. May wanna do more research there. The longer bolts go on the other end where it mounts to the rear, yes you want these no matter which TA you get.