mm spacing needed - brake master cylinder reservoir

would be very grateful if someone can provide the mm spacing between the brake fluid inlet ports on the top of the master cylinder for a Bay Window Kombi.
We want to see if we can put one of these reservoirs http://www.justkampersaustralia.com/shop/brake-fluid-reservoir-for-servo-master-cylinder-j11250.html on a standard beetle mastercylinder in an early bug that only has a single port reservoir in the front wheel well.
The ports on the bug master cylinder are about 85mm centre to centre.

cheers.

I believe it's a no go. I know the grommets are an issue that seal the res into the master. The kombi cyl has a much bigger port. There is a Volvo res that fits straight into the stock dual circuit master, but then the res is out in the elements. Better fitting a late style res on the lh 1/4 using stock parts. I made one recently, here's a link http://forums.aussieveedubbers.com/viewtopic.php?tid=91358&page=11 , or there is a kit CSP does as well.