Would appreciate any help from the manual steering club!

Basically, i've got all of the bits i need except one, which Renault tell me is no longer available and in fact, doesn't even show up on their latest Dialogys or the systems at Renault UK when he phoned for support!

Its the bolt thing that i've highlighted below, part number 07 06 253 004

Can anyone describe what sort of bolt this is, looks like a specialist one for the job from the round head... cheers