Just did some measurements. I wish they had standardized on one slot width!

Screws for MS 1908
Front Receiver Stock Screw
Actual: .024 x .400
Rear Trigger Guard Screw
Actual: .019 x .300
Under the Trigger Guard Screw Unable to directly measure slot width.
.024(est.) x .350(actual)
Front Sling Swivel:
Actual: .023 x .220

Screws for 1952 MS .30-06
Front Receiver Stock Screw
Actual: .032 x .375
Rear Trigger Guard Screw
Actual: .032 x .350
Front Sling Swivel:
Actual: .020 x .200

Screws for 1952 MS .270
Front Receiver Stock Screw
Actual: .030 x .375
Rear Trigger Guard Screw
Actual: .032 x .350
Front Sling Swivel:
Actual: .020 x .200