Les,
They seem to be available for Weaver and EAW bases, and Ruger integral dovetails. Go over to Brownells, and look for Cat. No. 661-000-035 for the Weaver type.
These are listed as by NECG, so they would be made by Recknagel in Germany. Peter Van Meurs of Pro-Cal in Geelong is the Aust. agent for Recknagel, and would be your best bet.

Haven't come across any that are made for the Leupold QR bases. The Weaver type would work with the Leupold QRW system though.

Ok guys been looking for a peep sight which will fit onto a Leupold QD rear base, where I hunt the weather and conditions can change rapidly and scope covers are out as it can be fast snap shooting, any ideas, I think they are available for Weaver type bases but I can't find any info for Leupold bases. any help would be appreciated....Les

Ohh the rifle is a Win M70 Super Express in 375 H&H...Les

Here is a Pre-64 with Talley bases and Talley Peep-Site.




Here is a M-70 Classic with Warne Premire bases and Ashley Outdoors back up sight.