I am puting CTR pistons into a b16a and they don't fit the rods. The small end is too wide and would need to be machined to fit the piston. The small end is 20mm wide the ctr piston is only 19.7mm. The p30s that came out were 22.3mm. Is this normal ? I though the pistons were a direct swap!! The pistons are 13010-PCT-000 and appear genuine but I got them on ebay

 

You need to get the sides machined -1mm from both sides. Thats what I did.