The grab handles were already removed by the "smart guys" , the bike came without them and the rack was shipped afterwards. So I don't know what screws are there now. Just to have some fun with my story I will shortly explain it: the bike was on sale on the internet with the pictures of the bike containig the OEM windscreen and the OEM rear rack. As they were an official Guzzi dealer somewhere in Southern Italy I said ok, it should be all fine.
The bike was delivered without the rack but honestly being so excited I did not observed it is missing...until my girlfriend asked me what she will grab when all the horses will be unleashed

. So I called the dealer back to thank for being so clever and to send me the rack. And as a reward for being naughty and ask for what I paid, they sent it without the mounting kit.
Anyway, the story is longer than that, for example at my ver first ride some oil start leaking from the valve cover: they told me that they will fully service the bike before sendig it so that's what they did...but without replacing the gaskets after the valve check... They simply put back the covers with the old gasket broken, big parts missing from the cylinder head edges.
So here I am now, asking for help even though at a certain point I will take off the current screws and see what I can do.
P.S. I'm thinking to write my aquisition adventure on a new post, to have some fun about the Italian pizza makers...sorry, mechanics I mean