I understand the 1 bolt that comes with each prothane motor mount is an #*$^&$ allen head for some insane reason. No way I can reach underneath headers with a allen head. I'm limited to a gear wrench.

Anybody here find a straight up ordinary bolt that fit the prothane mount threads?

 

I cut the short leg of an allen wrench down to about 1/2" in length, then I was able to fit it under the header primary.
The mount bolts are a higher grade than your standard auto parts hardware, so be careful if you replace with a hex head bolt.

 

I used a hex head socket with a few long extensions.

 

Any hardware store with a selection of Metric grade 10.9 ( the equivlant of grage 8 standard) will have what you need.