Technical 63’ Impala upper control arm bumper install

Hey guys I was redoing my suspension and the upper control arm bumper didn’t get installed when I put the coil spring. Is there a way to install the rubber bumper after the fact? Is it even necessary? This is for a stock 63 Impala

 

With the car on the ground, grease the barb and you should be able to push them into place. I think they’re needed, I even run them on the race Vette.

 

I have a busted one on my '66 I need to replace. I believe it was the type with a stud and nut.