@Faisal if you intend to stick with the stock rims, then you can get any tyre with 185X70 R13 specs. This is closest to the factory one in dimensions and you will have least of speedometer related errors.
If you are planning to change the rims too, you can go for either the STEERMATIC size i.e 15 inch rims and tyres with 185X55 R15 specs.
If you want to install a 14 inch rim, you can go for 185X65 R14 tyres. I have got the same size in my idsi. The speed error is minimal -