'67 Notchback Roof Rail Seals
Just to verify what you are trying to install, are you saying that the part number your trying to install on your 67 Barracuda is Metro 4001? If that is the case, that part number is for a 68 to 70 B-Body sedan / coupe. The 67 to 69 Barracudas would use part number RR 4001-D from Metro.
We have not really had an issue with customers complaining about the fit for the 67 to 72 A-Body roof rail seals. It is just an interference fit and there is a right and a left.