AGM batteries have some specific charging requirements. Look for a charger that has an AGM setting. Chuck
I had one of those nice repro batteries in mine and when it crapped out about 6 months ago I tried to order one and could not get an order through. I was ready to drop the cash but could not find one and I really needed a battery NOW! I'm glad you are getting yours. I hated to toss that expensive good looking battery out.
No, the battery crapped out about six months ago not after six months. I estimate it was about 5 years old as it was in the car when I first got it. Might have been older. It went through a lot. It was being undercharged by a bad alternator when I got the car and it pulled heavy duty because the car used to take a lot before it would crank over. I am very satisfied with that battery and its cool you got one. I wish I could have found one when I needed it as I would have gone that way. 
FYI...For people that want an electronic solid state regulator and dont want to buy a generic electronic one, take off the cover and replace it with the correct cover, Virginia Classic Mustangs now sells all electronic ones with the correct covers.
