You are right, my Deluxe is significantly larger in all dimensions than my much smaller Kapruf.That's a Canadian 56 at top right. Stem/bit is very similar to the Sterling at bottom. Each of my '9BC' stems is different (some shorter, some with wider bits, some with flatter extended bits) - it's possible that one person at Peterson was responsible for the Canadian stems and that he/she also made other stems that sometimes, but not always, ended up on pipes imported by Rogers.