Front engine mounting bolt/rubbers are they available??

[gaffer77]

Hi looking at my bike today,noticed the front top rubber on the mounting bolt for the engine is so perished,bolt is nearly touching the engine case,just like to ask , can you get new or nos one's anywhere??
and anyone know rough guide price and are they an easy fit??
thinking if the rubbers just push in,, then it will not be a tight fit,,
so thinking it could be a git!!

seen a couple on ebay but not for long time now !!