If it's paint protection you're after, rather than something grippy for your knees, I can recommend Ventureshield. Really tough, virtually invisible and doesn't peel or discolour over time.
Steve at Chipguard can still supply either three piece tank sets or full protection for the S2R/S4R.
https://www.chipguard.co.uk/product-...product-page=3
http://www.ukmonster.co.uk/monster/s...ad.php?t=56977