https://www.ebay.com/itm/Buick-GS-NOS-1969-1972-Air-Cleaner-Seal/163313102094?hash=item2606382d0e:g: This is a lead.
That seal is for a GS 350 and not a GS455 which is shorter in height. I have a NOS 350 seal in my shop that I would sell for a lot less.