Isn't the passenger side where the washer bottle is supposed to mount? Every MK1 I've owned had it there.
I know there is one to the transmission as I have cleaned it and others in the past.
Looking good. If you like the red interior, I have a nice red dash, some red door cards, red seat belts, red shifter surround, and red headliner I pulled out of my Caddy. Only problem is that it's very bulky and shipping would be a nightmare. Bumper cap is still available from dealers on special order, or a lot of retailers on the interwebz. Found in 30 seconds.