I worked directly on the 14" and 15" Superlites with R&D, fist off they wanted to put the spline adpapter on the backside of the wheel to give it the look of some works Lemans wheels of day gone buy, which was neat idea, just not easy to accomplish. At the end of the day new wheels had to be made with much greater offset to make up for the offset being robbed by the adapter on the back. I don't believe any of the offsets on the splined wheels I worked with came close to what was needed for a Triumph TR 4. Bottom line splined drive wheels were a tough market, most guys want new spoke wheels, so they sold marginal at best, we have no plans to make splined drive wheels with the new VTO wheels, you can blame me for that I convinced them to abandon the spline drive effort, they just don't sell in great enough numbers.