I am needing to replace the battery in my 58 Ranchero. It appears that Interstate 29NF-VHD and Optima are my two choices. I am not sure from looking at the Optima website if their battery is a direct replacement as to size. I am interested in feedback from other members as to experiences w/both batteries and pros and cons. Also, if I might have missed another option! Thanks in advance, James Q, Ruston, LA