I am builing the H9 Sopwith Camel. I purchased a Saito FA-82 for it as recommended in the maual as opposed to the OS 62. I installed the engine mount and the mounts are too far apart to allow me to mount the Saito. Am I missing something? Is the OS engine wider? The mounts have to attach at the pre-installed blind nuts. I am sure I have them in correctly with the engine head pointing down and left when looking from the front. Are the blind nuts factory installed incorrectly? Your help is appreciated.