Push on lens hood for Asph. 35 Summicron.

I use a push on lens hood, designed for the 35 Asph. Summicron, on my 50mm Summicron (latest, but non built-in lens hood version) as well-though I have to be careful to keep it aligned and not turn around.

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I do so because of the convenience of a push on lens-cap, which saves me the trouble of taking off the hood everytime I have to close up.

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Questions - What is the part number of the lens cap?

The 35/2 asph lens hood is part no. 12 526 and the lens hood

cover is part no. 14 043. The original front lens cap for the 50/2

lens, without any hood, is 14 268. The original round vented 50/2

lens hood came in; metal, part no. 12 585 or, plastic, part no. 12

538, and reversed over the lens for storage. The reversed hood

took a slip-on cap part no. 14 033.