Hello monkeyman831
I am with John on this one
I too have never seen those lugs before
But the entire rail mount, t-rods, claws,
Legs, leg brackets, muffler knob, and diamond plate on the 12"
all point to ..Hoshino..(not Hoshino gakki)
My guess would be that those lugs
were an early prototype for the more usual and somewhat similar shaped lugs
(one of two styles they used widely)
It may have been either a durability issue which is not likely
or that they found a way to use less material in their castings by a slight redesign
thereby lowering production cost
That looks like a Hoshino kit ..me thinks
And I am that very same glutton for punishment I could not have resisted based on those odd lugs alone ...
Great find and Best of luck Kenwood