Measurements are:
5/8 inch diameter Phillips head
7/16 inch shoulder diameter
the threaded portion is 9/16 of an inch long
You will find that many replacement shoulder bolts are zinc plated. For use on early 1970 Corvettes…
Does 1 seat
Philips head seat side rail / hinge shoulder bolts. Overall length = 1 1/8 inch, Threaded portion = 7/8, 5/16 x 18 threads.
These are longer than 342156 which are 7/8 inch long Set Of 2
SCREWS BOLTS SEATS
…
Set does 2 seats - Includes:
483159 2 pair 1969 Seat Back Upper Stop Bumpers - Round
483216 2 pair 1968-1969 Seat Back Lower Stop Bumpers - Round
342156 Set of 4 1963-1970E Seat Hinge Pivot Bolts
342031 Set of 4 1965-1978 Seat Side Rail…