I couldn't find them on that site.
They may not be listed, but i'm sure Tommy has them, or can get them. He built all my wiring harnesses. Does great work. Send him an email.I couldn't find them on that site.
for back up lamps:
http://www.oemsurplus911.com/automotive/lightsockets/8535.htm
without weather boots:
http://www.oemsurplus911.com/automotive/lightsockets/8546.htm
http://www.oemsurplus911.com/automotive/lightsockets/8547.htm
neither one is the original one which are pressed on to housing. These are generic replacement snap on kind, which is "good" being able to replace bulbs when burnt without remove lenses, but from underneath the housing