I have a set of the 3 m231 drive springs that sit inside of each other in the receiver extension.
https://www.dropbox.com/sh/z7kc70gtf36n9gf/AAA2Xh00PjjXuJ3l5QxdnoSfa?dl=0
I don't think they have ever been used but are not in a package they are just loose so I will say they are used exellent condition. I can send more pictures if you would like. Price for the set is $250 OBO. Please let me know if you have any questions, rtonking250@yahoo.com Thank you, Ryan