I'm getting the mounts I got from Dean figured out now. He sent me these pix of the mounting board so I'll post them for future reference. He's been good to deal with and helpful with the pix too.
This looks like the demountable mounting board.

Yes, that's Carrier No.23 (the renamed No.3). It's got a few bits missing, but nothing that can't be made up with hand tools.

In the photographs, you'r ;ooking at it from the back, so it goes set, supply unit and control box from left to right.

The missing parts are two of the steel angle plates at the outer edges of the set and supply unit (the straps go under these), the backing plates for them, so they don't rip the bolts through the wooden baseboard, and the fasteners to hold them together. They can be copied from the pair that are still fitted.

The carrier fits into two of the "Carriers, Mounting" brackets that were in the original photographs, using the steel strips at each end of the Carrier No.23.

I want one of those carriers, but Canada is a bit far for shipping, I think.

Chris.

Here's another piece Dean has. What is it?

Absolutely no idea, but the multipin connector is a British 'W' type used on aircraft electronics, so it could be radio/radar/navigation systems related.

(I only do the land based stuff, I'm afraid.)

Best,
Chris.

I got these pix of a 19 set mount off ebay. I gather this is the Carrier no 1. It uses the same rubber shock absorbers as the no. 3. This mount comes with the radio at a buy it now price of $1125.

Yes, that's the No.1 (or 21).

1125 USD is seriously overpriced for a WS19 setup, IMAO.
(Unless it is _exactly_ the set and install kit for your particular vehicle, is complete, and includes shipping.)

A complete setup on Carrier No.3 recently went for 250GBP over here.
No accessories, but most of them can still be found for that particular configuration.

It's the WS38 Mk.II that seems to have gone mad price-wise at the moment.

Chris.