Goodyear EfficientGrip Compact and Dunlop SP Touring T1 tyres are options available for the 165/70 R13 79T Vauxhall Nova 1.0, according to Tyres.co.uk. Look at the filler cap lablel and the handbook. The fitments may differ based on the engine, year and the body style.
The tyres on the Vauxhall Nova can be found on a sticker located at the insde of the filler cap on the right rear side of the vehicle. The sticker shows the correct pressure for the cold tyre and some tyre information. Be sure the specification for the wheels you have mounted matches the specification on the sidewall of the tyre and information in the handbook.
Vauxhall Novas do not require all four tyres to be changed at the same time. Because all factory Novas are front wheel drive, no models have a four wheel drive system, so four tyres do not need to match. When replacement is possible, fit matching pairs to the same axle.