WTB: 2d rear extension & other discussion

The 2D is in nice shape. I got the Ilex 12" mounted last night and
will try to shoot some this Sat.

My other lenses are an old Fujinon-W 210/5.6, so I'll build a board
for that lens, and a 360 APO Nikkor. The problem is my 360 APO
Nikkor. Since I don't have a rear extension it's a little difficult
to use. So I need a 2D rear extension. Who's got one?

Also ... it came with a 4x5 back in really nice shape (except of
course it has finishing nails in place of the original pins. No
ground glass either, but that's cheap so I'll get one before parting
with it. If you can put up with those, the rest is great. My debate
is: Should I sell it to fund the extension or just put out for the
extension and keep this to allow for closer 4x5 portraits (like with
the Ilex & Nikkor)? Still debating. (This weekend I'm going to a
hobby shop top look for metal suitable for pins for the 4x5 back.)

That dang Ilex is lacking something. Actually a couple of things.
Threads. And X flash sync. It's an Acme #4 shutter. Might be too
much efford/expense to add. My 58mm filter fits into the front of the
lens but falls out because it can't screw into anything. (I could try
duct tape and send a pic to Red Green, but am averse to supporting
even the best of Canadian television.) Your thoughts are welcome
regarding adding a flash sync (different shutter?) and some sort of
filter holder.

TIA,

Collin