Accoring to an old issue of M C M , if you throw the Triumph engine In , on the Norton Std Plates , Rear . you drill a new top hole .
The motor leans forward a bit .
a stick under the engine so ' free play ' is neutral - whack up patterns for front plates .
If youve a drill press & a vice , you should be able to replicate in aluminum .
If you dont want it leaning forward , redrill ALL the rear engine holes .