Ken hasn't been on the site for over a year. You might try his e-mail in his profile.
I'm going to guess that 1107055 is going to be 6 volt, as the Parts listing has 1105075 fitting in a 6 volt vehicle. 12 Volt systems didn't appear in Chevy's till later than '48, although yours may have been converted. What battery do you have in it?
