One of my all time favorite radios
I suppose the 5Y4 does "look" OK, but you'll need to test it to be sure.
Yes, Renovated Radios does have reproductions of all the rubber bits in this particular set.
Philco 38-XX Dial Assembly Bumper (PHB-38-10)
Philco Chassis Corner Mounts (PHS-COR)
Philco Tuning Cap Support for 38-XX (PHS-38-10)
(note: you'll need to unsolder and pull the tuning cap out to replace these. It's a little tricky, but it's worth it if your existing mounts are rock hard.)