Picts are here:
https://www.dropbox.com/sh/pcmzy24nw4gj386/jH97OQ_WVKI believe it's an old windsurfing mast. The spar itself looks like it was repaired in the same spot at some point in the past.
It looks like the chute is glued on with some sort of epoxy. I took it to Ellie's Sailing Shop today and he didn't think the chute could be removed without damaging it.
I talked to a local metal supplier and he said a 20ft length (of 1-1/4 which is actually 42mm outside diameter) would cost me about $60 but I would still need to get it anodized (I haven't priced that.)
A sunfish boom is more like 48mm OD so I was thinking it would be too big, but I can probably pick one up for very cheep. I would still need to either figure out how to swap the chute or get a new one...
What to do?