Dash attaching screws - size/thread specs please

Update: A quick check of the hole sizes in the body & dash frame followed by a trip to the local hardware store yielded appropriate U-nuts & 3/4" length bolts. The plan is to install the dash temporarily while loading up as many other parts & using the car as a rolling storage container in the shop this winter. This one is going on the back burner as I need to get another project off the trailer & into the shop before the real snow flies. Thank you to everyone who responded.