I'm trying to find the correct VSS to install in my transmission for my engine swap. Parts store listed 4 VSS that would work, all called out a different RPO code for them.

Can someone break down the difference between these please.

D8N
D8I
D8A
D8B

I have to specail order which-ever one I want. Thus, the part being non-returnable. I don't feel like getting screwed out of 40+ bux a pop.