[Riverside racer]

Seeing that Hi Tech South Africa cast and machine their OWN uprights and the spllned hubs for the 289 roadster as well as their OWN six pin hub for the FIA, possibly Superformance should get a mention. Original AC factory drawings used.
To answer the question tho`,All the car manufacturers use the same wheels be it 5 or 6 pin and it depends on what upright is chosen to determine what hub adaptor is reqd.
Take a look at Vintage or Trigo websites to see their variations of adaptors and wheels available.
PS ENGINEERING can make same style wheels with different offsets if so required. You don`t mention what car you have.
Regards
Ross