Some craft stores have sort of mix-and-match frame sides that are sold in pairs (so if you needed a 7"x48" frame, you would buy a pair of 7" sides and a pair of 48" sides, or slightly larger depending on how you're matting it). Even at that though, I'm not 100% certain that they go up to 48", and you would still have to have glass and matting cut to fit.
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