Vortrekker,
don't sweat having the wrong mount for the gun for now. Just try an make sure that the hole spacing is something relatively standard so that when you put the next mount on it won't look like swiss cheese.
There are a number of side mounts on the market and the simple contour of the Mosin makes it easy to work with.
Those EAW mounts are fine but pricy. Claw mounts would look best but good luck with that.
There are still U.S. manufacturers making side mounts.

http://www.midwayusa.com/product/317079/williams-side-mount-sm-71-base-only-aluminum-matte

is a Willams mount that uses screw on bases that hang over the bore. Actually not a bad set up. They have been around for years but aren't terribly popular. I have the standard top mount on a ruger 10-22 and I can use the scope as a carry handle.
You should be able to get into a set for about $100

It isn't steel, but then again Griffin & Howe side mounts have been aluminum for years and you could probably by 3 or 4 of these for the cost of one of those.

By the way, excellent thread

Tom