Thanks joyridin'! I dropped my rear suspension this morning and the left rear upright/carrier is cracked, so I'll need to replace those as well. Looks like these guys can supply the shortened arms and the uprights. Since the Brits voted out of the EU, the pound has dropped and that takes a bite out of the exchange rate.
I also found these guys in the US
http://www.jheengineering.com/jagprkit.html so I'll be making some calls tomorrow. Just about have everything disconnected, so the body comes off next weekend. I'd almost forgotten how much I enjoy doing this stuff!
EDIT: I neglected to add - It's an early Series II (I think), 3.54:1 Posi, 55.5" wheel flange to wheel flange.