Hey Weasel Diesel,

Your are correct, the item on the drivers side of the firewall is the voltage regulator cover made by Cal Custom (part #40-63). The finned item on the passenger side is a horn relay cover also made by Cal Custom (no part #). The horn relay on the original coupe (and mine) is a 1956 Corvette 913 relay. I don't really know why this is on the coupe as it is not hooked up. Here is a FREEBEE for you. The master cylinder on the origianl coupe can be bought at Napa Auto Parts Item#: UP34404. Encolsed below are some better pictures of these items for you to get a better look at. Hope this helps you out.

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