You have got to be kidding me!

the correct hood for Summicron-C is 12518, thread is series 5.5 as 12517 for Elmar-C.
Hood for Rokkor 40/2 must be 40.5mm, not series 5.5!
 
Adapter

Adapter

There is a Chinese eBay vendor selling a 5.5 to 39mm adaptor for about USD12 if memory serves.

I have a couple - they are well made and fit just fine.
 
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