Large nut for Tuff Neck stem

[Swivel]

Want to finish my GT for this months competition but need to complete this stem. 

Its polished up nicely but missing that BIG bolt before the stem bolt. Also the bolts themselves aren't too great. Does anyone know where I can get replacement bolts from? Also any idea of where to get a decent BIG bolt from?

Ta in advance,

Matt 

[djgivvinup]

Alright Swivel...i've got 3 of the black allen bolts for the stem going spare if you need em, they are used but still in nice condition, no churning in the allen key slot.  Well i have got all four but one of them is churned up 

lmk if you want em & i'll get em sent off to ya