The 65/8 Super Angulon is in a 00 shutter. The 65/5.6 is in a 0 shutter. I still recommend the 0 hole--adapters to mount a 00 shutter in a 0 hole are $15 on eBay.
But there is only one 58, and it's expensive and bulky--and that undermines the ethos of this camera. Both 65mm Super Angulons are cheaper, and the 65/8 is cheap and small--cheap enough to buy just for this camera and small enough not to look like bad plastic surgery.
Plus, I own a 65/8 that is begging to be used.
Rick "whose 65/5.6 is reserved for the Sinar" Denney