Bimini Top Supports

[BRIELLY]

I just got my bimini supports to hold the top up when I'm not using it. To install it i will need to remove the old hardware from the poles to slide the new plastic support in place. My question is are the plastic parts on the poles pop riveted in place? It looks like it but I'm not positive. The new plastic piece has a set screw which will be easy. I'm just wondering if anyone else has the same configuration with their hardware.