Some 5 years ago I reported in this Forum that, after much shopping around in search of a battery that would fit, I was going to try the Maxx-124R from Walmart. Last week that battery died. It lasted 5 years and 1 month. This time I just went straight to Walmart (as much as I hate shopping there) for a replacement Maxx-124R. Five years ago it cost $98 with no core trade-in; last week it was $82 including $12 credit for the old core.
The Maxx-124R is a perfect fit, reasonable cost, very acceptable quality, and readily available. I also like that the colorful labels on it are vinyl stickers that easily peel off, leaving a plain black box. For those of us not obsessed with originality, I think the Maxx-124R is perfectly adequate.
Off-topic aside: While at Walmart I also bought a new 50A "intelligent" battery charger. It has functions for fast, regular, and float/maintenance charge, for engine cranking, for battery and charging system diagnostics, and others I haven't tried, and has a nice digital/graphic display. It is compact, super light weight, and $45 on sale (darn you, Walmart!). We'll see how long this last lasts; in the meantime I'm keeping my old "dumb" iron core battery charger.
-Enrique
'68 280SL