Who makes 30mm ring/13mm rail rings?

I need an inexpensive, low recoil set of scope rings with a 30mm diameter and mount to a non-cross slot 13.5mm rail.

I've searched a lot of online sources, but they don't specify a 13.5mm non-cross slot rail, only saying "Weaver-style".

Can someone direct me to a specific link selling these type scope rings?

Thanks!

Try B-Square.
They make 30mm rings with airgun size 13.5mm clamps.
May be special order though.

http://secure.armorholdings.com/b-square/rings_sportutility.html

Is this is going on some kind of centerfire rifle or spring piston air rifle?
Since there are no cross-slots, you will also need scope-stop blocks or the rings will slip on the base with a heavy 30mm scope.

rc