must be a copper or aluminium washer.. no rubber o ring on the planet will survive the temps on that housing
is that arranged collection rob? tracked and insured? (curious as always looking for viable shipping options)
Well, well ... seems like someone has 'shopped me' to Star for bad-mouthing them (lol, kids),
It'll be a PITA Jamie, its down the back of the engine between the bulkhead and engine. Might involve a bit of crawling about above/under the car