I know a little more then when I first started looking. I was getting the same help you're getting now. I would say start with something that has an Imbel receiver, then decide if you want metric or inch and go from there. I honestly know nothing more about these than what I've already posted on this page.

USMC 1997-2002. 6173 CH-53D Sea Stallion Helicopter Crew Chief and Flightline Mechanic. Semper Fi!

"Be still, Taggart!"