Carl - WinChoke is the brand name you need. Be sure to get the flush fitting type and NOT the extended tube with the knurled end that takes a spanner wrench.
Greg - Yep... I used one of those brass Galazan chamber gauges and there's no ambiguity, its 2-3/4. I was kind of hoping it would be 3 since I have the same catalogs you do but it is most certainly not. I will ask John Allen at Game Fair about the bore on the SSS. He still has the original prototype that he sent to MacIntosh et al prior to placing his order for 350 more.
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