Hi Roy,
I bought the seat for my EW from:
Mr D Filer
Headland,
Score Lane,
Blagdon,
Near Bristol.
BS40 7RX
01761 462002
He sold me a base, which I drilled and attached four retaining nuts. I then sent it back to him and he covered it for me. He also did the leatherwork on my toolboxes.
Hope this helps,
Stuart.