E30 Zone

Hi there
I have just ordered a full polurethane bush kit for my E30 318iS but the seller is asking me for the size of my ARB.
Ive looked under the car but cant find the anti roll bar. Is there one or two and could anyone point me in the right direction as to where it/they are?
Cheers

This is the rear:



Viewpoint on this is from in front of the rear wheel, looking backwards and upwards.

No picture of the front, sorry, but it'll be the opposite side of the subframe from the steering rack, kind of behind the subframe beam that goes across the width of the car

cheers mate!
diameters sent now waiting on the package
thanks again