I used to have a DLE-30 mounted on this plane so I used the included standoffs. The standoffs are 2.36" long. The nylon spacers are each 1/2" and can be found at most hardware stores. I still needed to add about 1/16" to the standoffs to get clearance for the spinner backplate. I used the X-mount that came with the E-Flite Power 160 to make a template for drilling mounting holes in the firewall.