Ah, I understand what you were trying to say. And, yes, that is a problem, complicated by some manufacturer's wings having no slots at all. I just am not aware of a standard bolt hole spacing other than 11" O.C., hence my question. Thanks for the clarification.a bigger problem I should have said is that cam band slots in conjunction with bolt holes (obviously single tank configurations) do not necessarily work with each other to line up between some manufacturers..... more the problem with the cam bands than the bolt pattern,