Can't answer directly about the outer seals, but I think many
Corvette parts vendors in the US will export, for example...
 http://www.mamotorworks.com/corvette-1-113.html
 http://tinyurl.com/239wxh

A buddy of mine has a friend in France who owns a Corvette,
and he sometimes hand-carries needed parts when he visits France
(and the friend hand-carries back when he visits the US).

As for brake fluid, why take a chance on used fluid, it's not
all that expensive to buy it new. When I do a complete brake job
I normally switch to Dot 5 silicone fluid, which doesn't absorb water.
 http://en.wikipedia.org/wiki/Brake_fluid
 http://en.wikipedia.org/wiki/DOT_5

Here's a general page on brake fluid -
< http://en.wikipedia.org/wiki/Brake_fluid >.

Since you are in the U.K., heed the Girling
discussion.  Remember to stick with the
specified DOT type.  Never cross-contaminate
Silicone (DOT 5) with mineral or glycol based
fluids.

Link on boiling points:
< http://v8sho.com/SHO/BrakeFluid.htm >

I've never heard of salvaging wet fluid.  I
would guess that an old DeLaval centrifugal
lube-oil separator might work but I have no clue
as to setup or adjustments.  DeLaval is now
better known for dairy equipment than for it's
fuel and oil separators.

We gladly accept all the Sterling we can get our
hands on! And, your Barclay's card should be
good here.

Google is your friend:  < international corvette
parts >

One of the larger outfits is Eckler's in
Florida.  Phone number at the top of the webpage
will not work from the U.K.  Here are the
international numbers:

    International Sales:   1-321-269-9651.      
IIRC, dial a zero first.
    International Fax:  1-321-385-2102
    Online:  http://www.ecklers.com
        email:  < intsales@ecklers.net >
        Ask for a C3 catalog.

and, here's a link to Flow Chevrolet:
    < http://www.gmpartsdirect.com/ >
sometimes good for a part number.

There are many other fine outfits here that will
ship internationally -- most accept VISA, MC,
AMEX.  AFAIK none of them will ship COD to the
U.K.

If you see one that interests you, ask here for
someone's experience with the outfit.

--
pj

I would image, given your problem that the caliper bores are worn-out beyond
tolerance. 1970?, they're nearly 40 years old!  Rebuilding brake components
is false economy. Someone further into this thread referenced the U.S Army
(Silicone Brake Fluid - BFS), The Army banned rebuilding of hydraulic brake
components in 1979. Back in the day, with lower speeds, less autos on the
highway, and not nearly the amount of aggressive driving as seen today, it
was a common practice to overhaul brake cylinders and the like. Not worth it
anymore. Then there's those that say "I want keep my car original and
authentic". Well, if you put more emphasis on aesthetics than you do
safety,.... please get off the highway,  as I have several grand-children
that have enough dangers to worry about in this crazy world without having
to worry about some nut with shade-tree brakes on their car.

Think about it. If the seals did stay in the bore, and you got out on the
road, had to apply the brakes in an emergency, and THEN your seals
popped-out, what would you do then?

You wouldn't put rebuilt tires on your 'vette, so why the brakes?

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