Fixing curtain pole

I need to fix a curtain pole above a pair of patio doors. The 3 x fixing brackets each have 2 no. 6mm holes.

 

Could someone more knowledgeable than me please advise…

 

What diameter & length of screws should I use (it will be fixed to a concrete lintel)?

 

… and it probably seems a dumb question (sorry) but what size wall plug and drill bit?

 

Thank you for any help but I’ve just decorated and don’t now want to make a mess of the wall 😊

 

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