The steering connector has pins termed "twin-lock", also used on Fords, but the housing is not avail. Most use junkyard parts and being under-dash, the plastic is usually still fine. One thought is to pick Dodge motor-homes since seems they used some 1960's connectors into the 1980's or 90's, probably as a way for Mopar to use up parts. At least, I found some useful connectors in picking, maybe even a steering one. BTW, I recall that connector was used in my 1969 Dart and think it changed when they moved the key into the column to double as a steering lock (~1970). Many other connectors are termed "Packard 57" or "Terminal 57" and used on GM's too and even home appliances. You can buy them on ebay and a few websites (I have, don't have ref at hand buy you can google). BTW, I think all/most Year One Mopar harnesses are made by M&H, based on their label I've seen on the bag, so probably cheaper and quicker to buy from them direct.
