in ref to the seatbelts, i managed to pick them up brand new from VW parts supplier direct - they were down as actual one's for Edition 40, but tbh i think they are all the same. they did cost me fair bit at the time - few 100 but that was during lockdown & i'd had a few beers when i came across them so....yeah bought them lol
to have them done was few 100 also, but obv where i went i had the gloss black trims done at same time. plenty of seatbelt firms out there tho, which can do them cheaper if take mechanism's out and send to them