Last night me and my buddy threw on a set of hooker lt's on his 99' SS.
Went in smoothly i must add. 
Buttoned it all up when i came to realize he had no block off plates or anything like that for the headers and intake mani, my fault for not asking first. The headers had the ports for them but he wants it to get tuned out along with the AIR, so we hooked up the EGR when one of the flanges broke. So we welded a patch on it to block it off. So now we deff. have to get rid of it.
Whiplash if you can get me a list through your place i would buy them through you.
There are three EGR/AIR ports coming off the headers (first two parts numbers i put up)
One on the intake manifold. 
Just want to verify these are the parts i need 
99-86EGR  Thunder Racing LS1 EGR Block-off plate for exhaust manifold/header, stainless steel, 1998-2000 F-body 
99-86SP  Thunder Racing LS1 Smog Pump tube Block-off plate for exhaust manifold/header, Stainless Steel, 1998-2002 F-body (2 required) 
20-12558346  GM EGR Delete Plug for LS1 intake manifold, 1998-2000 LS1 f-body/truck 
This is the website i used for these part numbers. 
http://www.thunderracing.com/catalog...&sid=223#P1038