I didn't find any slam-dunk type answers.
The most satisfactory solution seems to be something like this:
Confer Plastics A-Frame 7200 AG Pool Safety Ladder
Prices for the Confer model above seem to range from $170 - $280. The most common brand for this type of ladder was Confer Plastics, which claims to be US made, on their website.
Walmart advertises a similar product, calling it a "Heritage AG Pool Ladder" which is almost certainly Asian made, for $175. I'd prefer the US product, if possible.
Intex makes some cheaper -- and much less sturdy looking -- replacement ladders. The ladder for 36" to 42" pools is $53; the ladder for 48" to 52" pools is currently $105
They both look like this:
Here's a link to an Amazon search for well rated AG pool ladders which are sold by Amazon, rather than 3rd parties. (It's MUCH easier to do returns to Amazon, than to 3rd party sellers.) Regardless of where you buy, I'd read through the reviews on Amazon carefully; some seem to refer to situations like yours.
Good luck
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