Problem solved !
I was able to use the pulleys from Jet with a little modification. The bore is about 0.015" too small. I used a neighbor's lathe with the bowl jaws on the chuck to spin the split pieces. I removed enough metal using 150 grit sandpaper wrapped around a 3/4" dowel to allow the split parts to slide freely.
The OD of the Jet pulleys is about 1/2" less than the Delta, but the ratio is the same. They work fine. I would suggest removing about 0.010" from the end of the shaft pulley that abuts the collar to avoid excess friction, as it is too tight otherwise.
You will need a 26" V belt.
I got the Jet pulleys from JPW Industries; there are other sources.
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