I purchased a used Z and it has a front plate. Does anyone know where I can get front bumper plugs? any that are painted would be preferred.

 

You could go to bumperplugs.com and order yourself a set. Hopefully they'll have a set that closely matches your SS.

Or you could do what I did, and buy some nylon plugs (from OSH, Home Depot, et al) and then paint them with some touch-up paint. Nylon plugs were less than $2 and this mod is one of the easier DIYs out there.