[Jacques Reed]

Hi Ryan,

5/16 UNC x 3/4" long should do it. Suggest you get them at proper bolt and fasteners shop however.

I personally give Bunnings and Masters a miss for fasteners for anything to be used on my vehicle. I found some "5/16 Imperial bolts" I purchased at Masters had a head size that defied any spanner in my garage.

They were too big for 1/2" and 13mm and too sloppy for 9/16" and 14mm.
I finally tried an old 1/4 Whitworth in my collection and it was a perfect fit.

I suspect the Chinese manufacturers were working to 60 year old info about standard screw sizes in Australia!

Cheers,