rear arb bushes

What size are the rear arb to chasis size i bought some ages ago cant remember what i orderd 12.13.14.16 the ones i have are to big it does up ok but doesnt really grab the bar i think i orderd 14mm but cant quite remember i should just go out and measure it but was wondering why so many different variants listed i know whiteline etc did them so whats oe size and others to work out if i got a standard arb or not ?

Ok so i went out and measured my rear arb and it comes out as 15.3mm

Afraid I'm not help mate got mine from Bob on an arb ages ago

I would guess they would be 16mm bushes then as they need to be able to move

Maybe they are ok then just thought it would grab the bar tighter than it has ...

no it needs to be able to move to do its job but then it shouldnt be loose either if you know what i mean

I undone the drop links and could push it down wich i didnt notice before as when i fitted it i loosely did the arb to chasis mounts then drop links up tight then measured it to make sure it was central and nipped the chasis ones up so i never noticed and play from first time with the way i did it .