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Pgh Ultramatic wrote:
All the original foam gaskets are an off-white / ivory color and tend to be uselessly hard/brittle by now. The solid gaskets were black. Not that it matters.

The channel is 1/8 thk. x 3/16 wide so you can either use 1/8 wide, or trim down 1/4 wide.

For the foam between the casting and the body, just use like 1" wide self adhesive and trim to the profile of the casting. Or cut it out following this template:packardinfo.com/xoops/html/modules/myalbum/photo.php?lid=18516

For the lower rubber pieces, use 1/8 thk. black rubber cut 9-3/8 wide at the base as shown in the 2nd image below, then after centering the casting where that dimension is across the inboard side, trace with a compass or whatnot normal to the curve of the casting, and cut accordingly, so that there is a constant distance from whatever part of the casting, to the edge of the rubber.

For 56th only, you need the welting around the outside (do NOT add this to a 55th car, the casting will not bolt back on the car properly at the top). I don't remember the bead width but 3/16 sounds right. You can only buy it from about 5000 different eBay stores as it is a common resto mod material. (Example:ebay.com/itm/310803110294) You should relieve the welting at the top of the casting by cutting a notch in it so that it bends easier around the sharp curve. The originals were actually cast pieces as shown, 4.16015.