My mechanic replaced the air intake flap. When putting back on, they missed out one of the bolts (this is no longer here) and cross threaded the other, so the bolt cannot tighten. As a result I’m having to replace the egr valve, but need to replace the bolts that attach the air intake flap to the egr (only need the shorter ones, the long one is fine) does anyone know what size the bolt is, or could anyone suggest somewhere that would have the bolt I need? 

Can you not take it back to your "mechanic" to sort out?

M6 x 45 Allen head with a flat washer by the looks of it; first of the item 8 parts?

vacuum system; exhaust gas recirculation - Fabia(FAB) [EUROPA 2005 year] (7zap.com)

1 hour ago, Wino said:

M6 x 45 Allen head with a flat washer by the looks of it; first of the item 8 parts?

vacuum system; exhaust gas recirculation - Fabia(FAB) [EUROPA 2005 year] (7zap.com)

I reckon your right, cheers mate 👍🏻