When purchasing weatherstripping from whoever, I would suggest that anyone should ask the vendor specifically who is the manufacture of the part. If they are not able to tell you, then search out another vendor. For some applications, you might find a rather inexpensive spliced together piece of various extrusions that will semi fit your application. Most of these pieces do not have the correct molded corners and the bonding together of the extrusions are questionable.
Clester's, Precision and Steele offer a better alternative. None of the three offer 100% coverage and they will typically purchase from each other to have product coverage. Clester's will be the lowest priced with Precision being in the middle unless the piece is actually a Steele piece that they are bagging for product coverage. Steele will be the most expensive. Both Clester's and Steele manufactures in North Carolina and Precision will manufacture outside of the US.
The Precision parent business is an OEM vendor to the automotive industry and I typically suggest them whenever the customer has the option. Pricing is very competitive and the quality control is very good resulting in generally a better fitting and sealing piece.
You can check around with your preferred vendors to get an ideal on the pricing. I feel that the one that Precision offers for the notchback application is actually a Steele piece that they are offering to have product coverage.
For the genuine style '67 gaskets, the only thing available is the Precision windshield and the fastback rear window gasket. Precision is the only vendor for the correct mylar insert and I personally feel that it is just a matter of time that this piece will be dropped. Most customers will update to the 68 style and thus basically no demand for the correct style pieces due to the rather expensive pricing. Good luck on the pursuit.
