Old Stove Pipe, New homeowner.

Hey everyone. I've been creeping on here for a while and it seems to be a wealth of knowledge, so I hope someone can help me.

I recently bought my grandparents old house after they passed. In it is a fireplace insert, with an old 14" triple wall pipe sticking into the attic. The last bit that went through the roof was removed when they placed a corrugated metal roof on it, but the hole is still in the wood where it went through.

I need to know where I can buy flashing for a 14" pipe. I like the ICC setup, and I could install that myself easily, but I can't find anywhere online to order it, and the closest place to buy is 4 hours away.

I guess I also need to know if there is anything else I need to buy, because it looks like a good caulking around the flashing and the storm collar would be enough to keep it water tight on that end, and the same with the flashing on the roof. That way I wouldn't need a boot.

Thanks for the help!

Below is my fireplace. Behind the fake brick is a rather large void on which the other side is the bathroom. Really thinking about going to freestanding unit in the future and reclaiming the unused space, but that's later.

The chimney goes straight up behind this wall, into the ceiling, and stops. I'll try to find a label or something on it tomorrow, but the outside pipe is 14" the inner most pipe is 8"

attached are images of the pipe I plan to use, no sticker. Also I scoured the door frame and inside the fireplace but there is no model number to be found. Once again, outside pipe is 14 inches and inside pipe is 8 inches. And I guess I'm looking for a new cage top as well since this one is so rusted.

I hate to do that, because it's still a good stove and in working order. It was never used a whole lot, and still has a few years left on it. If I can find a place that has the ICC flashing for metal roofs online I can get their 14 inch flashing and make it work. If I can't, I can always make the drive to get , but thats 3-4 hours.

So is there anywhere I can buy 14 inch ICC metal roof flashing online, and since I am not a professional, is there anything else I need or should know?