Do the terminal blocks sold by many Chev vendors (link provided for Chevs of the 40s) look right even though they only seem to be commonly in 3 or 4 terminal configurations? The vendors might be willing to provide their source to lead you to 6 terminal versions....
https://www.chevsofthe40s.com/shop/s...T&Seach=Search
Another search came up with a 5 terminal version at YnZ Yesterdays Parts
http://www.ynzyesterdaysparts.com/in...ewCat&catId=26
The following doesn't go direct to suppliers but lists suppliers. My thought is that generic auto wiring suppliers might be more willing to share supplier/source info to help you track back to 6 terminal strips than those that sell prepackaged strips to fit a specific vehicle... (even if it is really a generic strip, repackaged).