This has probably been posted before but can't seem to find anything.

Do you need an adapter for the din slot in the Fabia VRs dash as standard stereo is deeper than the Alpine. Is there any other wiring products or the like required to fit this system?

Also where do i get Briskoda tax disc holders

You need the trim to go above the stereo, available from Skoda, only costs about £3 and matches the dash perfectly.

Alpine shouldnt require any loom adapters, may require the two bullet connectors on the permanent and ignition lives swapping over. You will need an aerial amp though, get them from Halfords, about £10.