does anone know offhand the radiator size on a 99 w/5.3 or how i have to measure for e-fans.

 

28 inch radiator.. just get 98-02 ls1 fans, they will work..

 

Any suggestions for a good place to get them and are they a simple plug in

 

Ebay, and they require a wiring harness and either a tune or a controller to work. Do a search this question has been answered hundereds of times.

 

hey man, give Derick a shout for a harness, he took over making them for Matt (white1).
you can pick the fans up on ebay for ~$100-125 if you look around. You have HP Tuners and can activate the PCM to control the fans using Derick's harness.

 

There are a set in classified LS1 for $150