This page refers to all Series Minxes and Gazelles, as they have identical dimensions & shapes inside the boot.

My father, who ran a furniture factory, instructed me to make this wooden tool box for my Minx Series IIIA
in 1972 – hence the dimensions in inches.  These pictures show it in my current Hillman Gazelle.

Material:  timber particle board. Board thickness:  1/2 inch, except the base which is 5/8 inch. Mounting:  2 steel bolts (countersunk head in the box) with nuts under the car body.  Doesn't rattle. Outside dimensions:  Length 36"   Width (front to back) 6½"   Height 6". The front of the box is at least ¾" clear of the body (behind the rear seat backrest) to prevent minor rattling, and giving space to store a couple of spare fan belts.

The interior partition is to hold the petrol can in place.  I pad the can with rags on all sides to prevent chafing & rattling.  A fire safety fanatic might insist that the can be strapped in, so that it won't dislodge in a rollover, but it's very safe in any other situation.  I normally store engine oil & coolant to the right of the spare wheel, leaving plenty of room in the box for spanners, screwdrivers, spare globes etc.

Here's a simple partition that Barry Hall has installed in his Hillman Gazelle :