Silencer fitting

Hi
Had to remove the silencers (standard) on my SE, bloody wood screw so new tyre fitted

The thing is it looks to me as though the previous owner may have left off a washer either side, Haynes manual very unclear ........ Is there anywhere I can look up some diagrams or parts list to check this ?

Atb John

Still trying to find a genuine Triumph manual but hey ho

 

Thanks thebiglad ( Dave )
Yep thought so rubber washer missing from either side doh !