72 Door Panel Question

[Bisblue]

I have a rough 72 C20, I put in astro turf in for carpet, just a fun driver. But I can't seem to get one of the door panels to stay put using the small plastic fasteners (see picture). Any advice? They seem to snap or the panel detach from them. I'm not above any kind of shenanigans to get the panel to stay. It's got a deteriorating nature, so nothing that needs to be preserved.

Also I'd rather not buy the missing padded armrest for one side, anyone fabbed up anything cool to replace them? Mainly for closing the door.

Thanks in advance.