car has the shitty wrap around rubber spoiler, if i buy a straight wing spoiler will the it mount to the original holes

 

Dont think so, besides you will be left with the mounting tabs on the hatch and look like crap. Probably better to find a decent aero or get a base model hatch with the straight wing

 

No it will not.

I did this on my 86 trans am that had the same rubber wrap around wing

i went with the straight spoiler.

I had to fill in the old holes and put the new spoiler on top and mark where the posts/pegs sit and drill new holes.

you can't even tell what I did, It looks stock. but of course i did this when i was fixing up the whole car for painting. so i sanded everything down and rienforced the filled in holes.

if you remove the plastic interior panel from the trunk lid you will see 4 spots.

2 on each side. at the very center of each spot/hole that is where you drill fro the straight spoiler and bolt it down.

remove the panel and you will see what I mean.
goodluck