Not certain they have been made for past 30 or 40 years? I had similar in 30-06 - and currently have three for 308 Win. I think the exterior are all the same size (?) - appears that the folds in the side walls are different - at least 30-06 to 308 Win. A pretty "mickey mouse" attachment / "latch" scheme - they fall out easily when firing, I found - most likely from wear on the magazine "nubs" - mostly because of my experience with them is why I prefer hinged floor plates these days - nothing to go missing. I was able to swap a 30-06 magazine for a 308 Win magazine, here on CGN, but have not seen ads for them for sale in stores or on Internet retail sellers. If you try to dismantle your rifle, there is a third action screw - have to remove the latch from trigger guard and its hinge pin and spring - that Allan head screw is up inside the slot that the latch lives in. A weird-to-us thread on that - I think is #5 BA or # 3 BA - do not mess up that thread!