I feel for you Glen but like you said in your own post you opted to go ahead and make the trade knowing the car was missing things that were suppose to be part of the deal.
You either must of really thought that you were getting the better deal on this trade or your one helluva nice guy who just doenst speak up for himself and let's people run over you.
Believe me in this business of trading cars there are people who will take advantage of someone if they feel like they can, you got to be firm and stand your ground if it were me I would of sent his azz packing with no trade, deal or not.
I would call him if he answers and try to arrange a time ya'll can meet up in person to discuss the matter further. It does sound like he wants to make good on the shocks at least.
If he doesn't then just chalk it up to experience and move on.
Remember the definetion of a good deal is when both parties think the other guy got screwed.
Goodluck , Charles