Before I get a bunch of posts about how people don't like the look of this, and I should have just ordered my Mustang with the spoiler delete option, let me explain my choice.
1) I didn't want to wait 8 weeks (or more).
2) The spoiler I wantutilizes the stock holes.
3) I much prefer the way my car looks now, rather than with the stock spoiler.

I thought I would post this because I had a hard time finding any information about covering the stock spoiler holes. Any threads I found on the subject got a lot of the same responses - order the spoiler delete, or fill/paint the holes.
So, I went to Lowe's and picked up some automotive plugs and some silicone and decided I would try my luck. Worst case scenario, I would just put the spoiler back on. Here's how it came out....



And a close up...



The little plugs I got came in black, so I didn't paint them. But if your car's not black, you could just paint them with some touch up paint.

 

Looks good, I took mine off as well. I used 4 small bolts/nuts painted to fill the holes. I also picked up some neoprene washers to put on either side of the bolt to prevent leaking. I think the plugs look a little better and may switch it out when it warms up a little.

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Here's some more pics...just because.

 

See...
You don't have to listen to others telling you buying another deck lid.
You found your own way and it worked.

 

the plugs look pretty good; rather ingenious! i definitely prefer those over the bolt option utilized by the second poster (no offense goody625 )

 

Why not just buy a used spoilerless trunk lid instead of using half-azzed plugs?

 

I thought I made it clear in my first post, but I'll re-iterate.
1) My option cost me a total of about $5
2) The spoiler that I want to eventually put on the car utilizes the stock spoiler holes
3) I think that what I have looks better than the stock spoiler

But hey, thanks for stopping by and calling my mod half-azzed!

 

I think the mustang looks very "bare" with noting on the back. Somehow something is missing. But to say it looks bad? No way!

 

[:@]

Anyways, it looks great OP.

 

Quote:

ORIGINAL: zkiller

Why not just buy a used spoilerless trunk lid instead of using half-azzed plugs?

i disagree.

"half-azzed," or perhaps, "half-assed":
"–adjective, slang: vulgar.
1. insufficient or haphazard; not fully planned or developed.
2. incompetent; lacking sufficient ability or knowledge."

the op's mod hardly qualifies ; it looks rather well executed.