sorry Michelle - I'm 'standless' - never found one so don't possess any images of my own to show, so not remotely qualified to comment, and notice that many authors show boats without a stand.
If you have a copy of Thompson you will see on page 25 what appears to be your Ed. Bolton boat - but minus stand - so no help there.
On the same page - there is a reproducton of some comments from the Sowerby catalogue of the 1880's, which says......"one stand fits all boats" (which seems a little difficult to understand when you think of the enormous size variation). It's always possible that if Sowerby produced only one pattern of stand then other factories did the same - but that's my opinion only, and quite possibly a wrong assumption.
Hajdamach omits any boats, and Sowerby is the only stand I can see off-hand.
You need someone who actually knows what they're talking about..........Bernard, Neil or Roy might be able to help - anyway I think they are underestimated in terms of interest, and congrats. for a good boot sale find. Why don't you 'float' a separate thread on boats - and sincere apologies to Roy for massive hijacking of his subject.