Glad you've got it fixed!
I was going to reccomend going to Sony's parts website:
http://servicesales.sel.sony.com I don't know if they have the plates, but it's been my experience that you can find most things there, and all kind of random stuff. I've ordered parts from them in the past, and I've always had a great experience. And I can only imagine there are awesome people working behind the scenes there, because they've always anticipated what else I might need based on what I've ordered.
- Bought replacement silicon earbuds for my headphones, mentioned in the comments I only needed large if possible (they come in packs of 3 sizes) and they sent me 2 complete sets along with a handful of loose large silicon earbuds.
- Ordered a replacement stylus for a turntable, they sent me a record cleaning kit and replacement bands for it.
Those are just the things that spring to mind. If they don't have it on their site, it's not a bad idea to shoot them an email on what you're looking for.