Size of stock shifter bolts?!?!?!
 

I am in the process of replacing my stock shifter with a pro 5.0 Everything is off except the four bolts that hold the shifter to the tranny. I only have standard sockets and they won't fit. The 1/2 socket is just a little bit too small. Does anyone know the size of these bolts?? I would like to get the new shifter in tomorrow.

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89 GT 5-speed: Dynomax Cat-Back, Dynomax H-pipe w/cats
Waiting for install: ASP Pulleys, Pro 5.0, Densecharger