What type of timing belt

[Jezza-7]

Have seen two different types, one with 108 teeth and the other with 128

Which one would suit a 92 G?

[hayesey]

more than likely the 128 tooth belt (normally called a round toothed belt).  The other one is normally on older polos and has square teeth.  A 1992 polo should have the round one but the only real way of telling is by looking at it.

[Jezza-7]

Ah ok, thankyou!

[Alexiskayak_7]

If you tell at the seller the chasis number, he will tell you exactly what type of belt you have

[hayesey]

you can tell from the engine number too, I think ETKA/vagcat shows the ranges of numbers for each belt.