The response from Rimmers was you have had them for 2 years bad luck we will not replace them even though they had only been installed in a new motor build that had only been run for 5-6 minutes.
I'm guessing that there is no consumers laws like here where the goods that are supplied and are not fit for the intended purpose are refunded or replaced by the supplier
Actually there is, the consumer rights act. The brothers are claiming they covered by the 6 month time limit on faults. I am not so sure that is the case:
Six months or more
https://www.which.co.uk/consumer-rights ... rights-act
If a fault develops after the first six months, the burden is on you to prove that the product was faulty at the time you took ownership of it.
Now from your description the fault was present at point of sale. The compound on the guides was not up to spec, so Rimmerbrothers fault. The problem is proving that in a UK court, especially when you're in Australia, is no easy feat.
Frankly I am not impressed by the way this has been handled. People often buy all the parts they need for a restoration in advance, so it is unreasonable for parts to be used months or years after sale. It perfectly reasonable for us to expect the parts to be fit for purpose, after all they are supposedly the experts and are suppose to stock the correct parts.