General car parts: US
https://centerlinealfa.com/store
http://www.vickauto.com/newstore/
http://www.spruellmotorsport.com/
http://www.italiancarparts.com/
http://www.alfapartscatalog.com/
http://www.performatek.com/
Alfa Hoses & Other Items: US
1) http://www.hiperformancestore.com/
Alfa Carpets and Tops: US
1) http://www.worlduph.com/
General car parts: UK
1) https://www.classicalfa.com/
2) http://www.ebspares.co.uk/news4a.htm
3) https://www.alfaholics.com/
4) http://www.highwoodalfa.com/
General car parts: EU
1) http://www.vanlingenalfaparts.nl/ENG/