I am looking to buy replacement 02 / Oxygen Sensors for the front on a 1999 Camaro Z28. I was looking for info but I guess I am just not the sharpest tool in the shed .... so I figured i'd ask the pros.... Thanks.

I am also using mac mids on my 01 ss and I am having good results using
O2 sensors ac delco #asf97

Where did you get your sensors from?

I got them from a local parts house in the area that has ac delco parts
you can proably get them from the local gm dealer or check parts vendors
in your area to see if they carry ac delco--not sure if you want to cross ref
part for another brand try to stick with ac delco.
I see that your local is home of the raiders so that somewhere around here the place I got mine is allied auto in fremont.