Figuring out Stanley 2358B mitre box

I just picked one up and thought I had a great find until I started doing some reading and closer examination. I think it’s missing a few pieces but I’m not sure what or where. The few photos and discussions I’ve found online are regarding the 2358A – I’m not sure if the “A” or “B” makes a difference. But one major difference is that mine has plastic saw guides and all the photos I can find show metal, so I assume mine is a newer version.

If anyone has one of these, could you share some close-up photos so I can figure out what’s missing?

Thanks.