There are a lot of inter-changable parts.
A steel one from Jack First will cost you about $50. Just sent one back. Dunno about plastic. Never could keep ADL/BDL straight.
The hinged floor plate one coming is over $100. Proud of those things, they are...
But it will fit my 725 SA, which had a broken one....
OK - what I did was I took the one off my unused .243 700 SA and put it on the active .260 725 SA.... Now I need to fix the 700 back up... It's prettier (that's relative!) anyway.
The 725 is also already wearing a take-off 700TI barrel.. .screwed right on perfectly, exactly upside down with no further work required- sometimes one gets lucky... and luck is better than "good"!