Update:

Called Jet (thanks, Mike) and there was enough confusion there as to whether the part was available that I had little confidence I would get the correct replacement.

Went to Woodcraft and decided against the $200 Carter upper and lower system as that was almost as much as I paid for the saw a few years back.

Found a Carter look-alike on eBay -- http://www.ebay.com/itm/321200823928 -- for about $60. Looks like it will fit. Will report once I receive it.

Thanks to all for your input.

Larry