Hi there, I have a very lightly used RRS arca-swiss plate that will fit the first generation of Sony A7 camera bodies . This is the bottom plate and comes with the RRS thumb-screw (so you can remove it without a wrench), the small safety screw on the bottom and allen keys for both.
I had a Sony A7r camera for about 18 months, it never got much use on a tripod.
Let me know if you have any questions about the plate. It's packed up and ready to mail out. $55 includes CONUS shipping. Contact me for shipping rates outside of CONUS.