This is an old post, but I recently accomplished mounting 2 MasterLiquid Lite 120’s onto my dual lga1366 motherboard (Supermicro X8DTL-3F). I used m3x10mm standoffs in each of the cooler mounting holes permanently attached to the motherboard via the winged backplate. Then I attached the pump using m3-0.5x20mm socket head cap screws with m3 fender washer-spring-m3 fender washer above the bracket specified for the 1366 socket. The springs are 3/16”x3/4” compression springs with 0.020” wire diameter. The pumps are secure and there is about 2mm between the bracket and standoff, so I know the standoff isn’t too tall.