what size 4mm intake bolts do i need to for the 72cc mod on a 61?

[dieseldod]

i plan on buying a box of those long 4mm bolts needed for the intake of 272 , any of you guys know the length offhand . thanks

 

[NSEric]

Same length as the bolts in the 61's intake but 4mm.
I dont know the exact length but you should be be able to figure it out with the 61's bolt in your hand.