29m diameter
There are two different valve springs for the 4-CYL Petrol Volvo 200/300/700/900.
A spring with a diameter of 29mm
And a spring with a diameter of 33mm
You must first measure the spring so that you are sure which version you have to order.
You can mount the other diameter valve springs on your car if you also replace the spring retainers below and above the valve spring.