I have one pair of late type rear hubs that were converted to five lug pattern. They have 45mm Porsche studs installed. The hubs and studs are zinc plated. $175 shipped.

I have other sets without studs and have 50mm or 65mm studs that can be installed which will allow use of 6mm or 21mm spacers. $150 shipped without studs.
Bruce

My guess is that those hubs allow for using a fuchs 15x6 or 16x6 under a narrow body 74 914 without any spacers...correct?

The hubs will work with any five lug 130mm bolt circle pattern.

The 45 mm studs installed in these hubs will not allow the use of spacers.

The spacer requirement depends on the offset off the wheel.

I do have 50 mm studs for use with 6mm spacers and 65mm studs for use with 21mmk spacers. I also have hubs without studs for use with any other spacer lenght needed.
Hope that answers your questions.
Bruce