My 1967 P11 came to me with a mikuni conversion. I am attempting to replace with amal 930's and a reproduction air filter. My assessment is that where the carbs attach to the air filter the holes are not only uneven but slightly too close together. I will try to add photos. This is never going to work without filing or grinding down the inside flanges and also it appears i would need to shave some off in the areas that sit opposite the throttle adjusting screw. I doubt i can take much off of that area without ruining brand new carbs. Has anyone ever wrestled with the repro air filter?