Does anybody know if these would fit on the Fabia 1?

yes, they are the same fitment.

Excellent, thank you.

Don't take this as a criticism in any way (I'm just curious), but why?

Would you be doing it for aesthetic reasons?

Yeah, I've been offered a set cheap and was going to experiment with them.

A local Mk4 Golf had them on and it actually looked pretty good.

I've always wondered about late B5 Passat mirrors with the indicators? Most VW group cars of that era have very similar mirror casings (visually at least).

JON