That's my wagon in the pic with Michael's Alpine.
It's a Mk 2 assembled here in AU by Rootes Australia from CKD parts. The Mk 1 and 2 have the full length stainless mould that runs under the tailgate, a smaller screen and different roof line to your car which appears to be the last of the line Mk 4. Google pics of the Super Minx and you'll spot the differences.
As far as parts go the vent window seals were being reproduced here in AU, contact Frank on
schoen@iprimus.com.au They are reasonably well done but there were issues early on with the fit because the mould was reversed on the bottom making them difficult to fit. Shoot him an email to see if he has current stock.
The ply on the dash and the pad itself are NLA so you'll have to get creative there. The screen needs to come out to remove the dashpad similar to the Alpine/Tiger. As far as the screen seal goes try some of the suppliers in the UK, maybe start with Speedy Spares. They have a very good range of mechanical items and some cosmetic/trim items. I highly recommend them. Any mechanical parts common to the Alpine/Tiger you'll find in the US at Sunbeam Specialties or Classic Sunbeam. Whatever you do don't use Rootes Post Vintage in Holland for ANYTHING. Despite the pretty pics on their web site the parts are often of poor quality, their communication is appalling and if something does go wrong good luck getting a refund or any sort of final outcome.
Hope that helps, if you have any other questions shoot me a PM.
Lance.