As long as it’s the exact one I showed in my first post, and the vendor hasn’t changed anything, it should be a perfect fit. It presses in like any other acrylic crystal- without the gasket for the sapphire- that’s the thing. They may have been trying to use the gasket and that’s only for sapphire- acrylic doesn’t need the gasket becuase it flexes on its own and creates the seal by pressure fit. Try to press a sapphire into a metal case without the gasket and it will shatter.
If you have a crystal press then you will be able to install it fine. Press in crystal, then press on retainer, then reinstall bezel.
But if you don’t then you may have a hard time getting it to seat by hand- would be one hell of a hard push on the bench.
And it goes without saying- but I need to anyway as not everyone has the same DIY skills, do NOT have the movement/dial in the watch when you do this! Even though it presses in from the front, you need to push the sapphire out from the back and never do this kind of work over a dial as one slip….
😲