I understand about Terry, he's got plenty of 'stuff' !
It's hard to say, the NOS quarters usually run from $600 to $1000 for a single. NOS fenders usually run from $400-$500 for the right, and $600+ for the left - being that it's been discontinued longer. The latest version of the repop fenders has gotten good reviews, so that may have decreased the NOS fender prices a little, but certain cars/owners demand NOS - just have to find them! Outer rear houses usually run about $150-$200 per side, and an NOS front bumper? I've only seen the rear ones, so I don't know what they go for, but I'd like to have one too
So, doing all the math, I'd say that it's a fair swap.