My 1949 GMC 3/4 ton was in pieces when I bought so did not see how many items were originally installed. The cowl ventilator is ready to install and I need to know how many bolts, how tight to install, etc. There are two slots on each bracket of the ventilator that match brackets under the dash. The holes are long so not sure if for adjustment or what. Do all four slots get bolts? The connection to the actual control arm is straight forward, but would like help on the bolts size, placement, etc. on the vent itself.
