You can keep the stock backplate n use longer screws to hold it
Clebb the measurements i need is the full lengh of the card
then from the centre to the rear of the card n centre to edge of card for the 2 holes at the rear opposite eachother.
Then the 2 at the front centre to rear edge and center to edge of card.
use the crossfire/sli finger edge
I would send that pic i promised however my pc is down my corsair ssd is dead.