Rob,
There is a boot around that has a high Silica content great for heat and lubricants very durable ...can't recall where i got them as they are in plain poly bags....though I did by some very similar with a high silica content for my '02 HSV Coupe(they were nothing like the OEM's originally on the car)grey in colour and seemed a Sh!t load more durable!!!
I'll dig around for the original receipt on the others!!...
OZ