O.P. is in Bahrain - That's the Middle East. He may not have access to ebay or cheaper parts specialists there.

The 140 Coupes were the most expensive Benz's of the period. Only the 600's were only more expensive than the C140 500 Coupe. There was a limited amount of them sold. Not all parts were common between the w140 coupes and Sedans. After market stuff maybe hard to find for his exact car.

Restoring a 500coupe to original specs may take a certain amount of time to arrange - especially in Bahrain. It could be that the O.P. has nowhere else to go than the dealership.

Cutting the front springs on a car like a W140 Coupe is a travesty. M.B. spent over a Billion bucks on development getting the W140 right.