BenzWorld Junior Member
Date registered: Feb 2011
Vehicle: 2014 C250W, 1970 911T
Location: PA, USA
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Thanks for your reply. I'd somehow gotten the idea that the Hydrak diaphragms were still available.
I bought a replacement VW Autostick servo diaphragm (which are still being manufactured) and, although it is a near perfect match in contour to the Sportomatic servo diaphragm, it's only about 75% the diameter. The Hydrak diaphragms in that link also look exactly like the Sporto diaphragm.
I'll be dropping a line to the host to find out more about the Hydrak diaphragms.