will the doors and dash from a 2000 Chevy Suburban fit in a 1992 Chevy Blazer?

[country joe]

What modifications must I do for them to fit?

 

[pat]

Alot of modifications... I'm going to assume you're talking about the full-size Blazer, a.k.a. K5...

It can be done, you'd have to modify mounting points, and the width may even be off... the doors would look tacky since you're going from square early 90's style to more of a "curved" look on the 2000 Suburban.

Get doors off of a compatible vehicle.