Dunlop (OEM British wheels)*
The splined adapters bolt onto standard bolt-on-wheel hubs theoretically,
but the adapters' inside dimensions require careful modifications to
the hubs. The spline size is the same as the original 289 cars,
but is smaller than a Jaguar spline.
The bottom line is these wheels are not as strong as the Dayton desgn.
*Note that these wheels are also distributed by Dayton.