What size quill adaptor for a 97 P7...

The CRC labeling is wrong, that's what is confusing the issue. The 22.2 is to fit inside a 1" steerer (i.e., converts 1" quill to 1 1/8 ahead) and the 25.4 is to fit inside a 1 1/8" steerer (i.e., it should say 1 1/8 -> 1 1/8 ).

I'm pretty sure you have a 1" steerer, if you're sure that it's a 1997 P7 that you have, but you can check that yourself I guess.
 
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