Given that the correct ones have no clear photographs or references (and none exist on current traps) that's a rather... boldly assertive claim. The Heathkit ones I have match the Sedgwick scenes *perfectly* (perfect size, shape, etc). You can get a lot of different sizes of Heathkit knobs, there's a rather large range of sizes. Now if they are *not* the right ones I'd love to know what *is* because afaik no-one has an alternative (and most ppl seem to use resin copies of the Heathkit ones painted black anyhow).
However, that aside, thanks so much for that link. No wonder I couldn't find it, it being buried in the depths of a build thread...
For future searchers, here are the links:
KN500A 1/8" (GB1 silver front knob)
KU4025B 1/8" (GB1 small round black front knob) - annoyingly often out of stock.
MS91528-1T1B (Raytheon pointer knob)
Skirt for Raytheon knob (search for (KNB) Z31)
The metal and round ones are *not* confirmed to be the actual knobs but they *are* basically as close as anyone has been able to find. The Raytheon knob comes in a lot of variants. This one has the white stripe (like most of the screen used traps seem to have had) and no skirt around the base.
The Square knobs seem unidentified (that build thread just uses resin models in the kit he used).
So it seems like, while the front knobs aren't exactly identified, we're close to good with 3/4 of them. Square still unknown/sourced as far as I can tell.