ORIGINAL: wjcalhoun
Another quirk about the DLE55RA, which you can see in Pic 21 above (choke linkage). The standoffs normally install with the flat-sided end against the firewall, and the full flange against the engine. However, the SHCS that hold the two crankcase halves together interfere with the full flange, and one has to install the standoffs backwards, with the flat-sided end of the standoffs against the engine mounting lugs.
You are correct, the "full flange" should mount to the firewall. The "full flange" provides a little more area for "load spreading" against the wood.