I am confident that all ford part's dealer's and employee's do not know everything about ford part's. I have attached the battery spec chart. The 96r is smaller in dimension. It is available in 500cca and 590cca. I have bought that battery and returned it. The 40r is a BIGGER battery in size. He should have got off his a?? and compared the two. I did that. The 40r is the only battery recommended for 07 and 08 mustang shelby gt500. Look in the gt500 supplement handbook and it list's only the bxt-40r. That is the battery it left the factory with. They were all black with just the top black label as in my previous photo of my battery with the charger clamp on it. There were no red motorcraft sticker's on them. Battery Specification Chart 7-2018.pdf.
I really have done hour's, day's, week's, and month's of research on this battery info. I have alot of useless knowledge on this. Chatted with ford, motorcraft, interstate, and battery reconditoner's. I even did internet research in europe and found they put the 40r in 2007 maverick's.