1787 NJ copper variety help

I bought this Maris-43 Bulbous head variety, but apparently the 43 has 43-a,d,y Etc... You get the point. SO how cant i break it down to the correct sub variety? All google does is show images but I cant tell them apart. I want to say mine is the Y variety.

 

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Not a NJ copper expert but I did find this. Hope it helps. Good Luck!
½ Penny - Copper - New Jersey – Numista

 

The options are 43-d and 43-Y, this one is a 43-d which is a rarity 1 variety.