Yep. They were/are a little over £20 plus VAT...

Thanks for the replys.............just got last one from Mike at JHP.

Excellent, I have maaged to dig mine out but not yet pressure test it, I think I'll do that before putting it back in the spares box.
No part number on it so not sure if its from a 996RS or a 998RS as the 998R it came on was fitted with a race rad off a 996