where to buy valves piston kit?

[thataveragebro]

Hey peeps, I saw on vintagecb and cb750supply that the piston kits are only fitting up to a 76.. anyone know where I can buy piston kits or valves for a 78 cb750k?

 

[crazypj]

As far as I remember only the K0 pistons were different as they had thicker tos (better for machining to fit into CB125 ;D )
All the SOHC pistons should be OK except for the 1978 F2 because that had bigger valves so valve cut away is too small