Ok. I may have answered my own question:

http://www.cip1.ca/ProductDetails.asp?ProductCode=VWC%2D251%2D798%2D401%2DAS

I thought one of the Vanagon vendors had something better. Rebuilding a
clutch cylinder just for fun may be a waste of time.

A manual steering rack I ordered from CIP was also advertised as "Good
Quality Reproduction".
I don't see the same exact part advertised any more, and I'm no expert by
any means, but the tie rod boot quality on that part looked and felt shoddy
so.....

Neil.

On Fri, Jul 25, 2014 at 2:47 PM, Neil N <musomuso@gmail.com> wrote:

.... is clutch master cylinder life span mostly determined by the quality
> of rubber used in the plunger or elsewhere?
>

--
Neil n

Blog: tubaneil.blogspot.ca

'88 Westy http://tinyurl.com/c8rlw6p

'81 VanaJetta 2.0 "Jaco"  http://tubaneil.googlepages.com/

Vanagon VAG *Gas* inline-VR Engine Swap Group:

http://tinyurl.com/d7gd5ej