1.2 carb engine code

In desperate need of piston rings, but my supplier needs the engine code, its a 1.2 carb but i keep finding different codes -
12ST - 1196cc (1.2) - 1983-1992 (X-K reg)
12NV - 1196cc (1.2) - 1990-1992 (H-K reg)

Where on the engine will i find it? i dont want to end up ordering the wrong parts, then only find out when ive got a stripped engine,

Also for anyone that points out the obvious check the date with the above, its '89 but is booked as a 1.0, and i cant find the guy that put it in :/

cheers, Blake

Will more than likely be st mate if it's carb, I think pistons are the same only difference is fuel injection ie manifold and electric fuel pump. The code should be on the block near the head iirc

Cheers, I'l have a look

What's your reg number start with? 12ST isn't always the 1200 carb engine, my h reg silver nova was a 1200 but not a 12ST...