The 57 radios where angled in the dash, trying to install it to your truck dash would not look good! The wonder bar is a two piece radio ,you'd have a real mess installing it ,In 57 they built a hybred, it had a transistor output and low voltage tubes, this was a one piece push button radio this might be the one you have. It was such a piece of junk that later on in 57 a two piece push button radio came out .
As for value , I do very little sales and service on 55-57 Chevy Passenger radios, I'll only buy the 55-56 manual tuning and that's for parts , I met a man at flea market that had a 57 Wonderbar he try to sell me I said I didn't want to buy it, he took one of my cards then called me at home and tried sell it again to me ,I said to him you sell it and I'll repair it! just put my card with it ! GOOD luck I too think that eBay would be a good place, don't put any money into it! sale as is .
