[LASJayhawk]

I'm assuming we're talking a 37-610T so An S-7 speaker. Cribbing from Ron's spreadsheet it was used on:
60, 260B, 37-60, 37-61, 37-62, 37-610B-T, 37-620B, 37-2620B, 38-62, 38-9T, 38-10T, 38-60, 38-620

Looks like an S-12 used on 66B and 66S or an S-14 used on 610F, 610T, 620, 625 should work as well'

Link to Ron's speaker spreadsheet: http://www.philcoradio.com/phorum/showth...hp?tid=215

it is the aptly named spkrs.zip file