I've decided that I want to convert my 66 MGB to a single 12-volt instead of having the two 6-volt batteries mainly because it will be easier to get them now (no one local has the 6-volt, but they were not short on laughter when asked). Is there anything more particular to look for in the single 12-volt battery besides a Group 26 battery? If you have any particular brands that seem to work better than others, I'd appreciate that, too. Thanks!