Pic of rogue spacers - (steel, not ally like all the foot peg spacers) These fell out from the RHS of the frame when I removed the engine. I hadn't spotted them in-situ and only found them when they hit the steel deck of my bike lift.
I can find no mention of them in the Haynes manual or the Ducati parts list (Ta Albie)
Have replaced them where I felt they should go, where a spacer that size fitted perfectly once I'd sanded off the powder coating on the mating faces.
Rear RHS mounting
Front RHS mounting
The journey continues...........