Rusty Those holes are threaded for AN 12 and AN 16
Meziere also has the fittings for them if you want
                        John

Hi John,

I know they recommend AN12 and AN16 hoses, but I wasn't sure about the fittings.  Meziere does sell a number of fittings that go from straight AN threads with an o-ring seal, to either hose, or male AN hose fittings, so I figured you were right.  Now, I just downloaded the Meziere catalog, and it specifically says the Mazda adapter block fittings are 1" NPT, and 3/4" NPT.  The adapter block will be here tomorrow (I love Summit Racing), so I guess I'll know for sure then.