Help : how to fix a Omega Railmaster plexi 135.004 ?

Hello,
I need your help, please! I would like to change the plexi of my Railmaster 135.004 (my watchmacker will do it!).
I bought the correct ref PZ5098. But when I recieved it, It looks a bit bigger for the case. I know than it's normal but I have a doubt on this : Do I need to remove the "fixed bezel" (I mean the ring fixed as a bezel on the case) to put it or could I just ask my watch macker to fix it as basic plexi without removing the bezel?
I hope my question is clear...? 😕
Thank for your precious help!

Hi.
How wide in mm exactly is your 5098? I have some old, real NOS ones I could measure to compare. Also which style Omega Symbol does your plexi have?

Your man could take the bezel off if it is easier to fit the plexi but I cannot remember ever having to do it.
Thanks, Michael

Thanks Michael for your reply. I will check the exact size of my plexi and will go back to you today. I bought as new and I guess it's a service plexi, I will check it this too.

So it seems to be 33,3mm and about the logo, it's not the old one, but I'm not sure.

Thanks!