Hello, I'm in the middle of restoring my 348 and I'm trying to fit a Wes silencer but it doesn't line up the the centre box, the bike came without a silencer but has an alloy plate fitted on the frame mount? Anyone seen this before?

I'm assuming you are asking why the mounting holes do not perfectly align with the muffler sitting there.

How close does it get to the mounting holes lining up if you lift the muffler?

If that's not enough, you could loosen the exhaust mounting bolt near the airbox and loosen the bolts at the cylinder and try moving the exhaust upwards.

If that's not enough you could bend the end section of the exhaust upwards.