FYI I mentioned this before but some years back I went to a local source for batteries, recycling batteries, etc. and found I could get a HEAVIER gauge wire made to my specs. for less money than I could buy one. Plastic cap over terminal? Extra positive leads? A little longer to make install easier? Split ground wire to link several locations? All not a problem. Price was good, delivery 2 days. They made them for semis, forklifts, custom multiple battery setups, etc. I'll bet they have such a shop in your area. Only possible problem is a)you specify what you want, and b) on a true classic car any part "not factory" is likely to reduce points in judging.

bmw john in indy / avon.