I bought some at Lowe’s in Calgary, it is window foam sealing tape, comes in rolls, & different thicknesses.

I went to Lowe's & their selection was very thin. Same with Home Depot & Ace. Thanks, Joe

Maybe check with a local window manufacturer? Or can you get on line and see what local other Lowes carrys it?

Good stuff: Better than Window Home use item.
Grainger (Vendor)
3M
Urethane Foam Double Sided Foam Tape, Acrylic Adhesive, 1/16 in Thick, 2 in X 5 yd, Black
Item # 15C177
Mfr. Model # 4056
UNSPSC # 31201527
Catalog Page # 1392
3M™ 4056 double-coated urethane foam tape roll is an open-cell foam designed for indoor use: mounting soap dispensers and air fresheners, signage, kickplates, and other miscellaneous mounting. Offers excellent shear strength, good temperature resistance, and vibration damping characteristics. Acrylic adhesive.

I know your trying to help. but I wouldn't use that its open-cell so it will absorb water. you want closed-cell

I noticed the selection from Lowe's here are very thin, too!

its in the mail Joe.

Thanks Donnie. Almost ready for it...Joe

EVERY 1st gen I have taken apart has had a narrow foam strip about half as wide as the weatherstrip channel and it is kind of "goooo-ey".

My research indicates the original is a polyurethane impregnated foam seal... I have seen NOS pieces for sale in the past and it looks nearly identical to the set up I have used in restorations and is shown below.

I used a open cell foam and then took a paint brush and coated polyurethane sealer into it then applied. It seals well with no wind leakage.
FWIW 2nd gens used a black foam the width of the trim much like shown above.


PHOTO

https://lh3.googleusercontent.com/pw...-no?authuser=0

My LA built 68 had that. My Norwood car had different. Maybe they had a couple of different suppliers...Joe