Well done with your purchase, the GTV is only really a two seater as you've found out. I have fitted JVC bluetooth systems to both of mine and they really improve the quality of sound, (so far I have kept the original speakers). Most black leather GTV driver's seats fall apart, find a re-trimmer and get it sorted as a seat from a breakers is unlikely to be in a better condition than yours. Autolusso might have the rest of the interior or if not then AlfaAndy normally can point you in the right direction. Try to get to Brooklands on Saturday, that will help you gain some contacts.