I'm not really sure I understand your question, but I'll try.
First off if your talking about an end plate with a sling loop, then maybe something like this for lefties
GG&G
You can find that same type of end plate for lefties and it should be on the right side of the rifle for a lefty. Like this one since you're using a sling
GG&G
If you have the standard sling loop on the fixed buttstock then you can't just remove it cause the butt plate screws into it. You could take a dremel tool and cut it off flush with the stock. I don't use mine, but have never cut it off. I just left it. I've never had an issue with it being there.
I use a Sully Stock which is fixed, but shorter than normal fixed or A2 stocks. It has been a very long time since I messed with the actual A2 stocks, so I might be wrong about the sling loop. On my Sully, the screw that holds the butt stock pad in place screws into the sling loop.