Hi,
I got screws from here before:
https://www.tonysscrews.com
Kits
https://www.tonysscrews.com/product....&categoryId=57
https://www.tonysscrews.com/product....&categoryId=57
They are they black steel screws so similar or the same as the kit screws.
Also does screw in packets.
Based in the US, so good for the imperial sizes screws on the old kits.
MiCk B. :-)