I wish I could be more help as I'm really not sure of the correct measurements/ what broadhead fits etc etc.
I CAN tell u my setup and hopefully you C's. extrapolate needed info from there.
I'm using collars on my Beman MFX 500 ( I think they 500s at least. I'm in my car - parked! - as I'm typing this ). They cut to about 29.5" in length. I'm shooting Alaska Bowhunting Supply Ashby broadheads which weigh in at 315gr though idk the diameter of the post/threads.
I can say collars add about 5-6 grains in weight to front end of the arrows. They also add quite a bit of strength as I've noticed on the RARE errant shot that may hit the wall instead of the 10 ring :-))
I'd say if you can't get a definitive answer get a pack and give'em a try. They not expensive and the folks at 3 Rivers real easy to do biz with. They'll answer questions, dispense advice etc and accept returns if they do t work with your setup.
Good luck !!
Be well and thank you,
John J. Montefusco Jr.
Sent from my iPhone
Answered on 6/5/2013 by Anonymous