8MM retainers/locks on 5/16 valves: OK or not OK?

Lunati black 10 deg thick 8MM locks/retainers. Brain fart here, I thought my valves were 8MM & they are 5/16. Will this be an issue & if so do both (locks/retainers) need to be replaced with 5/16 units. 360 SB & EQ heads. Will be raced. Was ready to go together when I discovered this (when 8MM lash caps were a loose fit!). Thank you for your time. RR