Can't list out all the spec of the screws but you may purchase according to which car you have.
Available Spare screws / hardware as below,
B Series
C Series
4x4 Metal Upgrades - those screws you found in this metal upgrade
6x6 Metal Upgrades - those screws you found in this metal upgrade
If let's say you have a B14KM, then purchase B14K & 4x4 Metal Upgrade Pack.
Shipping - USD5.00. FREE Shipping for order above USD79