Radiator on studs on top of bricks

I need to hang a radiator (160cm wide, 50cm high, total weight around 35kg) via two brackets to a plasterboard wall.
The wall is external, so that it has studs (about 12mm deep and 50mm wide) behind the plasterboard and then bricks behind the studs.
I am lucky enough to have studs in correspondence of my brackets.

However, I was wondering whether the 12mm depth of the studs would be enough for the screws to bite, or if I should reach to the bricks behind the studs and fix the brackets to them.

If I can use the studs, how do I make sure that the screws go through the whole 12mm, given that this will be prevented by them hitting the bricks?

Thanks.

Go to bricks

Bricks all day. Do you know for certain it's a brick wall- brick or concrete block fine, thermalite not so fine.

oldbutnotdead said:

Bricks all day. Do you know for certain it's a brick wall- brick or concrete block fine, thermalite not so fine.

Click to expand...

I can see red bricks after lifting a bit of skirting and cutting out a bit of plasterboard