Consider replacing the saddle plates and guide/retention pins too:
Lotus Elise version, used on the fronts on the Lotus, rears on our cars of course. Not expensive (that price is for one wheel, though) : https://www.eliseparts.com/shop/brak...er-plate-pins/
Also Nick at Austin Garages (member 'X13#18') does a complete set of plates/pins/pads, using original MGR pads, SFP000380. https://www.ebay.co.uk/itm/193933293...gAAOSwADVgQBMZ
Also look at his description and the photos in that advert, explaining right and wrong pad shapes.