need H shaped guide

I recently bought 2 replacement bottom rails from Swisco for my old Monarch doors which worked great (set into the new tiled floor so they are flush) but I found when I took the doors out I also need the top guides? (not sure if that is the correct name)
They are kind of an 'H' shape, made from rubber, maybe polyurethane?
Do you need a picture to identify them or is it a standard part?
I need 8, let me know price and availability please
John Boyer