Not sure if this will help you, but I use the VC LH-5 vented hood on my Biogon 35/2. The hood is a bayonet style and it fits the bayonet on the Biogon perfectly.
Cameraquest sold the LH-5 for use with the 40mm Nokton lens. I was initially concerned that the hood might vignette a bit on the 35mm lens. But I've not seen any evidence of vignetting.
I tried my hood from the 40f1.4 on the C Biogon 35f2.8. It does fit, though I don't know if it will vignet. The hood from the 35f1.4 Nokton (LH-6?) does fit on the 35f2.8 too. This one should be fine and not show up in the corners.
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