panhard bar diff mount

[ga-stepside]

I bought an adjustable panhard bar which is 1.25". I have an aftermarket finned diff cover and the bar hit the fins. I ground off the fin area that was hitting but the bar still hits the cover. I tried adding a 1/8" washer behind the bar but it still hit. Adding any more washers and the nut doesn't have enough room for full thread seat. Does anyone make a longer stud for the diff mount?