part# help

[grubby65]

I have a friend who has a 1967 Newport. It does not have the original seats and he is trying to figure out what they are out of. There was a tag hog ringed under the seat with 2888607 on it. Is this a valid part#? If so could someone help me identify the seat?
Thanks

 

[super-bee_ski]

I personally do not think that is the part number