I need a new track rod end for my 2004 Skoda Fabia vRS but not sure if its KOYO or TRW?

How can I find out which one I have?

A dealer should be able to tell you based on the VIN I believe. Or it might say on the fluid resivour cap, but that's not a 100% certainty

I'd hope that if the fluid reservoir cap "says" it TRW then the complete power steering system would be - in any case, by 2004 I thought that VAG only used TRW as troublesome KOYO were dropped. If you take off the fluid reservoir and examine it you should find TRW appear on the cap somewhere.

Though the other bit of advice about the dealer knowing from the VIN should work as well - and I'd hope that you would be buying this from a Skoda dealer.

it says on the rubber gaiter cover were it joins on to the rack..