Richard Grey Power Company...
Just the clarify what RGPC actually is...
The device may benefit from upgraded AC connectors. However the images of the device I have seen shows it with square AC outlet bits. And none of the aftermarket AC duplex have square fronts. However if you are in UK or EU or someplace with non-USA you can probably find good AC connector bits for your device.
Just to mention there are two 'opposing' notions around A.C. about the efficacy of upgrading AC power bits. Most here, seem to adhere to the wire is just wire, and and other than measurable standards there can be no difference, and then there are those who find many differences.
Since this site has far more wire is wire sort of guys, the three other responses are pretty much a no brainer writing it is a waste of time.
I, on the other hand, write that I replaced all the duplex outlets in my large power conditioner and my regenerator with Furtech GTX-D duplex. So GTX-D Gold, some GTX-D NCF Rhodium. All tols I added 17 Furutech duplex to the system AC. Was it worth it? yes. Would I do it again? yes.
I have no idea if your Richard Grey conditioner is worth upgrading.. The AC outlets usually are worth upgrading *keep the original bits, then if you sell it, you can put them back,)
As for the little gizmo on the backof the outlet? it is most certainly a filter, and should be placed in the same orientation as it was originally. I have several in the Furman REF20 conditioner, and pt them back on the new outlets same way as on original.
I also would not change the wiring arrangement inside the device,