The proper G body bucket seat tracks will bolt up to the split bench floor mounting brackets, if you can find the proper G body bucket seat tracks.
As to whether or not the '99 Camaro seats will bolt up to the G body bucket seat tracks, they SHOULD. When I switched the front seats in my '84 Monte several years ago, I tried a number of bucket seats from different GM cars that have been built over the past 30 years or so. The car originally had bucket seats in it. I tried bucket seats from an '84 Buick GN, an '89 Firebird, a 2004 Cavalier, and I finally settled on a pair of front bucket seats that came out of a mid to late '90 Pontiac Grand Am. The bolt mounting pattern on the bottom of all of those different seats was exactly the same, and my original '84 Monte bucket seat track bolted directly to all of those seats, with no modification required. I won't say for absolutely 100% sure, because some seats might be different, but the '99 Camaro seats should fit OK. Make sure you find bucket seat tracks. Split bench tracks are different.
BTW, it would be helpful if you used a bit more punctuation in your posts. They're a bit hard to read. I hope this helps.