I ordered a new DANA Spindle Nut Kit for a Dana 44 and oddly it doesn't fit my 1974 Blazer spindle
I really wanted to replace the spindle nuts with real Spicer nut kit, but I am not sure why this kit doesn't fit. It starts to thread and then doesn't. The chinese Dorman nut I bought does work but they don't have the nut that has the pin.
I really want the correct Spicer kit

I really wanted to replace the spindle nuts with real Spicer nut kit, but I am not sure why this kit doesn't fit. It starts to thread and then doesn't. The chinese Dorman nut I bought does work but they don't have the nut that has the pin.
I really want the correct Spicer kit
?