M25 tank valve replacement

First a bit of history, I guess...

I recently acquired a pair of 15.1 liter 230 bar steel tanks that were made
by Aqualung / Spiro... They have the M25-2 threads on them... Unfortunately,
FedEx managed to drop one of them on the valve and bent it so much that not
only will the DIN insert no longer come out, a yoke clamp will not seat
properly, thus I need to replace the valve and insert... It has the modular
valve on it, so I would like to find a replacement and the isolation tube
that would allow me to convert the two tanks into a set of manifolded
doubles (I think that you call them "twinsets")... I have not been able to
find *any* M25-2 threaded valves in the US, much less one that would allow
me to connect the two tanks together while reusing the one valve that is
still good... FedEx will pay for a replacement valve and DIN insert, but
probably not enough that I could just buy a new manifold and replace both
valves... Shipping from Europe to the US is rather expensive, but I would
expect them to handle it in-house and as such they wouldn't be paying *me*
for it...

Any suggestions or links to UK (or European) online dive supply sites would
be greatly appreciated...