Both parking light assemblies are now only available from VPI in Wisconsin:
http://www.vintageparts.org/partlocator.cfm
The driver's side is part number 914869. Last GM list price was $45.30.
The driver's side brake lamp is technically discontinued, but there are still 4 in stock at the Lansing parts warehouse. Part number 5971953. Your friendly GM dealer will likely get $62.42 from you for this one.
Paul