Which year's frames are interchangeable with a 2000?

I'm new to the 4Runner family. Just bought a 2000 Limited 4WD and found out I bought a beautiful truck with a rotted frame. after getting past the "Buyer Beware" lecture, I was wondering which frames are interchangeable with mine. I was told by one dealer that any '99-'02 4WD frame would fit. Another told me it had to be a '99-'02 Limited frame. A third salvage yard told me I could use a '99-'02 SR5 or Limited. Now I'm pretty much confused. Does anyone out there know for sure? I'd really love to restore this truck.

 

I found a rolled 2000 Limited and I'm going to use it as a donor vehicle. Probable start the frame swap next week. I'll try to post photos as we go if anyone is interested.