Get this. I have all the records from my 1988 Carrera and I found the receipt for the Interstate. It was purchased June 28, 1999.
Actually, the reason I was asking about others is the size of this thing. Although it has a handle, it looks like a real PITA to replace.
I'm actually quite surprised this battery has lasted this long in Phoenix. But I don't have a ton of starts on this car. Battery replaced with 15k miles, and my car only has 36k miles now.