New suspension bolts

[red astra]

Fitted watts links centre bush a year ago. Now rattling with excess play. Going to fit a new one but can't find new bolt which goes through axle. Tried e bay and all other suppliers but no joy. Bolt listed on one site as M12x161. Does anyone know if this is correct?. Called dealers and gave car details. Astra 1.6 J hatch 2013.Told him needed bolt for centre watts linkage bush... His reply.. "What's that" I explained in more detail... He said "That's a new one on me" I should send you an email with a picture and you can return it with the parts marked out you need. Needles to say never got the mail. Doh

Can anybody point me the right direction? Ebay or usual online boys not listing unless you got a land rover. 

[TourerJ]

I assume you have the old bolt, if so, measuring the diameter and length of the thread will give you the size. If the thread is twelve millimeters in diameter it is an M12 bolt and if one hundred and sixty one millimeters long it is an M12 × 161 bolt, I would Imagine.

It's important that the bolt is made of the right material, probably high tensile steel.

I am not a professional mechanic so as with all advice on the internet, check this out with a qualified person you trust .