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I've been through this myself. One Vararam airbridge fits the smaller 75mm MAF and the other (2001 and newer) fits the 85mm MAF.
If you have the 97-00 airbridge, it won't fit the larger 01-04 MAF.
You pretty much have to choose the correct Vararam airbridge based on the MAF you're running.
Thanks. I have the airbridge for the 97-2000 so I am stuck with the 75mm MAF until I add other boltons (intake, TB, heads, etc.) and then will have to change the airbridge or CAI entirely.