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Ya I figured as much. To be fair though I have to admit the 16" tom and the bass drum still sound pretty good to me. Its only the rack toms and snare that made me cringe. I think possibly because of the mahogany maybe? To be honest I am not sure but the only thing I liked about the drum set was the lower drums so I will keep those and replace the snare and 12 inch tom.
Interesting mix of old and new there. Give you quite a dynamic, which it seems you've noticed.
Let's get the easy part out of the way... No, you don't need an 8" tom and you probably won't use it much either. Would I personally buy one? Of course. They don't cost much and you add another drum, just in case. As far as practicality goes, for me the 8" is more of a percussion toy which matches the kit.
Now for the tricky part of your post... What you have is a combination of two entirely different drum kits blended together, and it seems like you enjoy the sound of the thinner all birch shallower drums than the thicker hybrid shell power toms. You've already put the 13" on the side and now you want to replace the 12x9 with a 12x8. (Personally, I prefer the 12x8 size.) But to answer your question... I'd say just go get a newer 12", 16" and bass to match your 10" and 14" toms and be done with it. You're slowly replacing your old with with a new one piece by piece. Do it all at once and save yourself time and money. I don't know if they sell a 12/16/22/snare configuration of the newer drums you have, but go buy that if they do. Keep your old kit as a backup or sell it to fund the new purchase and free up some storage space.
Made in Taiwan, so it's pre-2000. You might be able to get some information on it by emailing pictures and that serial number to Mapex. I've never seen those lugs on a Mapex drum before. I have seen them in replacement/custom parts seller websites. Those two screws are curious looking. The strainer looks like a generic piece. I've seen similar ones on newer low end Mapex stuff, but it could just be a replacement part like the lugs.
I would say it's not any particular series snare drum. Seems to be a special edition thing. Is there a decal or anything on the inside? Mapex dates their Black Panther snares by month and year. Maybe this has something like that.