The first four digits are the reference number. The number after the hyphen refers to the production run of that reference, not the style of the dial necessarily. You can't actually determine the production run of your watch since you are missing the case-back. Comparing it to other watches on the internet won't really give you that answer, since production runs and dials don't always have a one-to-one correspondence.
Anyway, if you are sure that it is a ref 2576, then any 2576 case-back will fit. However, you can never know if it is the right production run, although comparing finding a watch with a similar movement serial number might help, if it matters to you.
Also, before creating a thread on a forum, it's not a bad idea to take some time and read the forum thoroughly, familiarize yourself with rules and how things work. If you jump into a community without making an effort to understand it, it's not surprising that you could rub some people the wrong way.
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