Dick:
Are you talking about just the rings that attach to the deck and that the straps tie to?
If so, try wrapping a small wire around another to make the rings. The wire you are wrapping should be the right gauge for your 1:48 rings, and you wrap this around one that is the right gauge for the diameter of your 1:48 ring.
Wrap the same number of turns as desired rings plus a few spares.
Cutting each wrap off individually equals one ring.
Sorry if you meant something else ...
Bruce