FREY EX CHAINRING BOLTS (SIZE, LENGTH)?

[Britton scott]

Hello, wanted to switch out chainring on FREY EX PRO, just curious if you knew what kind of bolts hold chainring to stock spyder on the m620? Want to get those in a blue color so kind of need to know what to order. Maybe size (length, etc.). I've included some pictured of different bolts. Thanks!!