Rubber piece at rear end of sunroof frame/trim

[Bremar 2]

Hi, I had to remove the trim around the factory sunroof. At the rear ends  of each side piece there is a thick rubber/frame sealant lump. Please see photo attached.
Is this an actual moulded item or just the final form of a sealant used at the ends of the runners. 
any help would be appreciated 

thank you Bremsr

Edited 5 hours ago by Bremar

[Leslie green 109]

Its a bump stop for rhe glass,its rubber and ive one missing although yours doesn t look original.

Edited 2 hours ago by Leslie green