4 speed to S13 reverse switch relocation

Hi guys,

First post so forgive me if I'm in the wrong place.

Currently doing the 71c swap and modifying my bellhousing. I've machined down the inner bearing lip to 0.48" and was looking at the reverse switch relocation information.

The image I saw on the zhome guide shows it's been moved 22mm back. Which is fine. But in the image it looks like mine is already where they have moved theirs to?

I checked the bellhousing for my 71c I'm swapping to and the reverse switch is the exact same distance from the sandwich plate on both...

Pic 1 is the image on zhome

Pic 2 is my 4 speeds bellhousing.

My main question is. Am I being a tool and I've not realised my original gearbox is a 5speed? The old box has the inspection panel ontop with 6 bolts which looks like all other 4 speeds...