front target sight diameter?

[abinok]

Im trying to figure out what ive got here....
I know anschutz is 18mm, and gehman is 22mm, and theres the tompkins, and the redfields, and a few others...
but the inserts ive got are .665" which is just a smidge under 17mm.
The inserts ive got are the "classic" stamped metal type, but im trying to find a set of acrylics that will fit...
Anybody have any idea what might fit? or perhaps, where to find them?
Thanks!

[RyanIntershoot]

There are always some on ebay.co.uk I'm sure ebay.com have them too or a million retailers online inc. pilkguns.com, champchoice.com, intershoot.co.uk

Anyone who stocks Anschutz / Centra / Gehmann should have them