I have a good 3" on the passenger side of my '05 4wd. The heat shield is about parallel with the inside of the frame rail.
From just inside the UCA...............
I believe the head is 7/8".:oops: Sorry. Where the hell did I get that from?:banghead:
Summit Racing Part Number:DCC-5249562
Thread Size:3/4-16 in.
Underhead Length (in):1.250 in.
Head Style:Hex
Washer Included:Yes