https://www.buggypartsnw.com/index..../dr-pulley-slider-weight-26x13-for-400cc.html
The variator slide pieces are on the right side of the page.
They have an 800 number and are very helpful. I got mine from them. I really like them at higher speeds.
Scooterwest has Malossi rollers if you want to stick with rollers.
Haha .... just a bit . Cheers(USA is bigger country than the UK -LOL)