Voigtlander Nokton 35mm 1.2 ASPH Square Hood?

Hello, So I recently just purchased a voigtlander Nokton 35mm 1.2 ASPH II lens and i really want a square metal hood for it. Would anyone be able to link me to any?? It seems majority of them are just the round hoods

Voigtlander's proprietary LH-8 hood for that lens is round and 'vented'. Are you certain that square hoods (aftermarket?) actually exist for this Nokton, and that such square hoods do not introduce vignetting? Leica has a rectangular hood for its own 35mm, which may be interchangeable. It's also (unsurprisingly) horrendously expensive.

what size is the filter thread?