Hi Kevin,
always plenty of panels for sale on this web site, and as they have spent their life in Spain they are mostly rust free.
Remember when searching to use SEAT 131 not FIAT 131 and you will be OK, also remember to change the categories currently 'Coches' this can be cahnged to 'Coches Clasico' or if your looking for spare parts 'Ricambios y accesorios'.
Please dont tell everyone about the web site:
as im currently looking at the white 131 in Granada at the moment (with Cibies) some other nice cars on their as well, including a totally original series 1 in Burt! Orange in GUADALAJARA.
Im betting youve never seen so many 131's for sale on the same web site, just remember their are some subtle differences in trim between SEAT and FIAT but metalwork is identical.
Happy shopping!
Regards
Steve
http://www.milanuncios.com/seat-de-segunda-mano/131.htm