Broke a Bolt putting on new shocks

Broke a Bolt putting on new shocks. It's the passenger side front shock forward of the axle. The auxiliary shock on the right front went on fine. The bolt head broke off and the bolt is still in the metal sleeve. What is the best way to fix this? Have a mechanic drill out the bolt and replace it with a new one? Also, I think the shocks were the originals because they were Motorcraft, old and the right front was sagging a little bit. I'm on a budget and had to replace them with Monroe Gas Matics. They were $16 a piece and I needed six. Believe it or not it's a vast improvement and the shocks actually seem much softer than the ones I took off.