Current ebay prices on running auctions are fairly irrelevant.

The green pair will bring in the neighborhood of 250, and the black ones about a hundred or so less.

The "completed listings" link is your friend if you want to know value/price trends.

To answer your question about the L-pads/faceplate, you either make something yourself, buy used originals, or adapt a used different model that used the same chassis/faceplate as the 19. I'd just buy a pair of used 19XO's myself.