My son-in laws 69 NJ
Just checking
Looks to be the typical screw tapping very short Phillips head screws (intergrated washer with the flattened head) I find at the local hardware store
Also shown (lower section) on page 162 of the reprint of the Hardware and Utility Handbook that AMK did.
Would guess the 3/8" OD and likely 3/8" long (8-18)