Sliding door - middle runner - knocking during shutting

[Jim San]

Just re-assembled sliding door after slapping a bit of paint on the middle runner channel.

Ive reassembled the roller assy. to the door, the door lines up and shuts seemingly perfectly (lucky first try) - but there is a 'knock' as the pair of bearing rollers go around the corner (this happens just before the rear of the door swings in to latch). They are knocking against the metalwork.  Am I missing a damper of some kind

I've found a remnant of a rubber like substance in the slot - I'd sooner have the proper part rather than homemaking something from a bit of hard rubber!

Browsed the sliding door parts on BW but couldnt see what I thought would be a suitable part.

ta

[multisi]

There are 2 types of stop buffer on late sliders, Brickwerks have both in the sliding door section on the main body parts section.

[Aidan]

https://brickwerks.co.uk/product/stop-b ... door-late/

[Jim San]

https://brickwerks.co.uk/product/stop-b ... door-late/

perfect - thats it - many thanks.
I trawed pages of stuff and didn't see it.