Try Pro Bolt. www.probolt-usa.com They've got a huge assortment in different metals.Not sure about your space isues, but I tell you what I do with no space isues and you can Aply it. I just hit the top of the screw driver with a hammer a few times. The shock will transfer though the treads and make it much easier to remove. Don't feel bad enough people have done this someone is making aftermaket Honda velosity stack srcews with hex heads. Just wish I remembered who.