What size nuts do I need to bolt this spoiler down?

I need to know what size and thread count nuts to use to secure this spoiler from a 99 GT, same as the one pictured.

If you have the spoiler with you, them just take it with you to Ace or whatever and try them out.

I don't have it yet, but I'd like to be able to put it on as soon as it arrives and not have to bother going to the store and search, so I just thought I'd ask and someone might know off hand.

Sorry, I wouldn't know...try maybe the 4.6 area?

super glue & duct tape

This thread's title is slightly pornographic.

Well, for future reference, 6mm x 1.0 wingnuts fit perfectly. I almost eyeballed it, but I wasn't looking at metric stuff, so after I tried all the standard sizes, I switched to metric, just walking in and out of the Home Depot to see which ones fit. Installed it in the parking lot just before some rain hit.

Post some pics when it stops raining.

Aight, here ya go. It's not a Mustang, though, but it does have a V6.

2001 Ford Sport Trac 4x2
4.0 SOHC V6 Auto 5R55E 4.10 LSD

Oh, BTW, it runs a 15.5sec 1/4 @ 87mph. Not bad for a 4400lb vehicle.

Not bad...the spoiler kinda fits in with the truck.