GP seat will not fit, they are a wider seat because the W body is a wider car. GA seats do fit, but I don't think the GA colors are an exact match to the Alero's colors. The gray seems darker and the taupe is very dark. In fact, I don't even think the GA color is Taupe.
Any seats for the Alero and GA at this point are going to need recovering, I say head to the local junkyard, pull the seats, have them recovered, and have a nice day

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2000 Olds Alero 3400 SFI 14.53 @ 94.93
1985 Olds Delta 88 307 SBO 17.96 @ 76.99
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