Yeah, I did install those shims. In the previous post those would be the studs at #2 and #4. And I deduced from mazdatrix's site they would go between the housing and the block. Not between the housing and nut. Though as I am using a sandwhich plate and there are 2 gaskets in use one between the block and the sandwhich plate, the 2nd between the sandwhich plate and the water pump housing. So I should have used 2 shims per stud. What doesn't seem to fit in is the amount of seepage/ leakage that occured. As can be seen from the YouTube video seepage only from the #3, no where around that hole was leaking. But with the lack of evidence to support another conclusion I'll double the shims and hope for the best. If I were to forgo the combo gasket smeared with silicone approach would the shims still be required?