Lanny,I believe the 2 bolt goes in the backright side,the other on left front,
coolant sensors you should be able to get them from one of the corvette parts dealers,and I don't believe the ones that go in the heads require adapters.
if any machine shop threw out ANY of MY parts they there would be he## to pay as I own them not the machine shop!!!They should have given you ALL your old parts back!!!I would go and ask them for your old parts, if they can't provide them for you,they should replace them!!!! (JMO)
as far as exhaust bolts ...try a reputable parts house in your area eg Napa or carquest,I dont know whats in your area...
good luck
bill