sorry to say i'm fairly confident you can't get 17mm in 1/2' drive... all the ones i've seen are at least 20mm..
can't get a cheapo rattle gun (air compressor extension) as an option? i remember seeing a cheapo one at supercheap for $49.
However, if you don't already have the deep socket you may strip the bolt with the gun.




whacked it into my ek4 and i've only gotten one new rattle 

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