those i.d. numbers at the bottom tell you what size it is, its the first 4 digits you want to look at, i reckon the 32/36 is the best for a road car, from a-12 to a-15
if you aint got one of these or better on your 1200 i reckon you are kidding yourself, this is just what every 12e needs and you could have one on for round $200
definately worthwile investment, to be found on 2ltr ford cortina or escorts