Have you tried calling Phil at Fastlane. The 800 number is listed and he has been really helpful for me in the past in researching parts.

Does anyone know can you replace just diaphrams in this actuator like you can in the doors?

__________________
'99 S420 - Mommies
'72 280SE 4.5 - looking to breathe life into it
'84 300SD Grey - Sold
'85 300SD Silver - Sold
'78 Ski Nautique