Thanks Randy. Hmm, let's try it again...
AC/Delco 18M757 powermaster rebuild kit (no longer available from GM)
eBay Motors: Buick Grand National Powermaster rebuild kit (NOS) (item 320216604939 end time Feb-16-08 10:39:49 PST)
AC/Delco 18M755 powermaster brake switch
eBay Motors: Buick...