WTB Old Florida No. 4SA spool

Wondering if anyone has a lead on a No. 4SA spool for an Old Florida reel.

They’ve been discontinued, but if you picked up an extra at clearance you’d like to sell off, or know where I could find one, let me know. I’d use it to convert my 7/8/9 wt reel to a 4/5/6 (although a heavy one…)

If I don’t find one, I suppose I could just put 300 yards of backing on the extra standard arbor I have, but wanted to see what was available.