Hey Segamer, why are your SNES vert covers marked as retail covers on the site?
There are retail vertical and retail horizontal. Retail uses the retail art work. Custom uses custom artwork.
Ah, okay. I thought it was referring to the layout in general.
Actually so did I... 
Am I mistaken. The way I explained it was always my impression.
I've always thought it's:
- Retail Horizontal
- Custom Horizontal
- Vertical. <- always custom currently.
I do agree that Vertical can be separated into Retail and Custom, but it has to be first defined what is required for retail.
Screenshots, front art, back font type...