Had the battery go on my '98 just as the site logged off.
My initial attempt on the Friday night was Canadian Tire. Unfortunately their computer listed a $75 replacement that was not even close, physically, to OEM. They showed me $100. ones on the shelves that were similar, but had no equivalency charts and I was in no mood to get measuring tape out.
I ended up getting identical battery replacement (BXT-40R)on Sat morning at my local Ford dealer for $96.(trade price) and it has 18 month replacement and 84 month pro-rated warranty.
First time I've ever got a battery at dealer, but I'll be back whenever the one in my '97 goes.