Tripod Collar Bracket for Hassy 140 - 280 Zoom

I have a Hasselblad 140 - 280 zoom lens. I need the tripod collar bracket to attach to my tripod. This lens is heavy and I fear the weight will compromise the lens to body interface. The diameter of the lens area to attach is slightly under 3 inches, 2.95 inches to be exact.

Can anyone recommend a collar bracket? I have searched in Kirk, Gitzo, Novaflex, etc. Unfortunately they either list which manufacturer they fit, i.e. Nikon, Canon or Sony. And they don't list the inner diameter.

Thanks all

I had a somewhat situation with an older model 350 Hasselblad lens that had no connecter nor could I find a bracket. I had a machine shop make a removable collar that I could attach a quick mount to. It was not very expensive as I recall about $50 or so. The inside had to have a slight taper as well.

http://www.jeffreyglasser.com/