Instrument CLuster

I am on ebay just looking at all of the Silverado parts. I have seen several Denali and Escalade instrument clusters on here and they say that they will only work with '00 '01 and '02 model silverados. I have a 99. Will they work with mine as well as the others, or am I just out of luck? I'd really like to have a 120 MPH speedo and I personally think they look awsome, especially the Escalade ones.

This is what you'll have to get. It does cost alittle more, but it gives you a functional trans temp and the 120 speedo.

http://www.stylinconcepts.com/part.cfm?PartID=25146&PartFamilyID=908&SubCategoryID=171&CategoryID=1&lc=pfpartt

Speaking of trans temp, is there a way to add the trans temp gauge to the stock '02 1500 Silverado cluster and have it work with?