The replacement ones I got were a little beefier around the part the carburator bolts to.. They added a couple of "ears" to that part... Still not that impressive though... That is all that holds the carb on and the intake manifold pressed into the head... I was kind of disapointed to find Saito doing stuff like this... They were/are great running engines but for the price this part of the design is very disapointing to me...