Thanks. Yep may have to do that again.
But I heard they loose their initial softness once crushed. Only way to renew them properly is to heat them up with a blow torch which I don't have.
They are 18mm/14mm centre and about 1.5mm thick.
Hopefully on Monday I should be able to order a few new ones.
The rad came with a new one for the lower fitting but not the upper which is a bit daft
Lower fitting sealed perfectly with not much effort.
Thanks