Gates make Renault Belts and most other manufacturers, You could go to renault and i bet you'd get a Gates belt, doesnt matter whats on the Box, they should all be guaranteed, but... A cambelt company will wiggle out of any failure Claims unless you use one of their Fancy Tension Testing kits, Which Are Silly Expensive,
Just go to your local parts shop and get a belt or kit, These "piper" belts i doubt are actually uprated and probably just have a Brand name Stamped on them