Lens Hood Screw size for Skopar 1:4.5 f=10,5cm

I got Voigtlander Bergheil De Luxe 6,5x9 with Skopar 1:4.5 10,5 cm and I`m trying to find out what type of lens hood would be OK for this lens? I tryied rubber Zeiss S27 and it is almost OK, but it`s not:/ I think 27,5 mm screw in may be OK?
Maybe like this: http://cgi.ebay.pl/27-5mm-screw-in-...y_VintagePhotoAccessories&hash=item5642915a47