Who makes the low profile ones? I think they are SS or AL
These are the only aluminum ones I can find.
http://www.galleryofguns.com/genie/Default.aspx?item=102037&index=12&mfg=European+American+Armory&mdl=&cat=&type=&cal=&fin=&sit=&pid=&inv=
You might be able to swap in a different pad from a Mec-Gar magazine of similar external dimensions.
I ordered 2 mec-gar mags from hennings a few weeks ago and they both came with the standard EAA base, not the slim one like the first one I ordered last year.
If you are thinking about something like this:
http://www.czfirearms.us/index.php?topic=25806.msg239670#msg239670
http://www.czfirearms.us/index.php?topic=25806.msg167756#msg167756
Contact Joe on the CZFirearms Forum