Tonneau socket (behind folding hood frame)

Side bracket assembly, AHH7202 is fixed to the hardtop, AHH7203 slots into the tonneau socket and is secured with a bolt through the hole in the socket, another bolt goes through AHH7202 into AHH7203 (drawings from Leyland Workshop Manual)

Side bracket locating detail (image from Leacy MG Ltd)

Rear bracket (drawing from Leyland Workshop Manual)

Tonneau panel retaining plate (image from Brown and Gammons)