Wow. It's been a vusy thread while I've been away. Thanks guys.
The seats I'm referring to are these:
They're essentially the same as the R32 buckets, but with slightly different trim. I'm sure I've seen these particular seats retrofitted into a GTI. I'll have to take another look around.
I'll have a read of those thread provided (Thanks RR), but just had concerns about fitment as they're coming from an RS4 and not an S3.