Dude these seats are rubbish.....
dont go cheap on a seat.. and buy real rails
Real brides are not adr approved but are FIA...
Just think a seat connects you to the car along with the seatbelt... if you ahve a shit quality seat it coulds snap in two in a crash... also this is the same as rails they can snap
its up to you but i wouldnt be going cheap on a seat
do it right once
my 2cents