I am following Charlie’s advice and ordered an Interstate C75DT-XHD battery and not sure if a right-side positive will fit all 169 and older IHCC’s. I looked at all of mine and there is a mix of UL and UR but I see hints in older wiring that the positive is on the right. I need this for a 70 thru 169 and hopefully don’t have to worry about different battery box sizes. Is there anything else I’m not thinking of, these batteries aren’t cheap so I want to get it right. I seem to need a new battery every 3 to 5 years. Thanks all!