To help (or hinder) and for clarity, the Rover in question is the one in my avatar photo. While I believe the machine is a model 11046 which had the thinner rear tyres, the 3 speed gearbox, I have fitted the 5 speed g/b with its associated rear guard (larger hole for the g/b)the later model front guard with grill and wider rear rims/tyres.
This is why the photo is a mixture of 2 different models. The red was how the front and rear guards came but would have originally been blue. The frame is still the original blue though.