Correct Lens Shade for the Elmar-C 90mm?

Worth mentioning that there were two different rubber hoods, one for the 40, and one for the 90. Part numbers molded into them are different, and the amount of flare in the shapes are noticeably different, too.

The 40mm hood will work on the 90mm lens, for lack of anything better, but putting the 90mm hood on the 40mm lens causes severe vignetting.

Part number 12517 fits the 90mm lens. 12518 is for the 40. If I remember correctly, the same snap-on lens cap fits both hoods.
 
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