The FL-8988 should be the correct one for your 1960 manifold gasket. Maybe the one you got was mis-packaged.
I thought maybe it was mispackage too, but when I bought it off eBay I got a message asking to verify the year and engine. The guy told me I ordered the correct gasket and he would send it. It came in a bag marked "8988", but the holes were too wide apart. A different gasket (8597) is supposed to show up tomorrow and I'm hoping it's the right one. It's just been frustrating, but I still enjoy the work on the truck.
