These snare beds look nothing like any Supra I've ever owned, including
my current '70s 400 and '82 (Chicago) hammered bronze 5x14 - ditto
with my Acros.
Like every Supra I've ever seen, mine have very wide and gradual snare
beds that are difficult to discern with the naked eye.
Has anyone considered that the beds on the OP's drum have been added
by a previous owner (talk about an 'OH $HIT!!' moment) or do we think
these are OEM?
At this point, the only choice seems to be to relocate the strainer and butt
to line up with the beds. They do appear to be fairly narrow so narrower
wires (12 to 16 strand) would probably work better.