I would've taken a look at this Tel-Tru:
www.teltru.com
BQ225 2.13" stem, 100/600, TT 110th anniv glass, 1/4"-20,vented case, white pointer, w/wing nut, ind. box
BQ225 2.13" stem, 100/600, TT 110th anniv glass, 1/4"-20,vented case, white pointer, w/wing nut, ind. box
www.teltru.com