Thank for the links Leadfoot. I notice that part site lists the ISC for about $570 AUD while the eBay ad you linked wants $40 for theirs.
Thats a large difference in price points, hence why I'm asking members about their experience with any particular brands or supplier.

I also agree that many ISC's can last a while. I think the one in the KH was still original when I sold it, from memory, not sure.
But I do notice threads here where they fail. I guess it depends on a lot of factors.
Given that they can fail it raises questions such as; at how many k's do they typically fail? (when they fail), how much should we be paying for one? and which brand is reliable?