Looks like the same bolt to me, just the one that came out of HP's has had a nut put on the end because the threads are shot on the bracket i reckon.
I think i replaced mine with a stainless bolt.
M6 Stainless bolt with thread tape to fix yours HP.
I can supply said bolt and washer in A4 Stainless, i'll even throw in a spare washer and nut
