my truck cab dint have holes at the front - it used a nut-plate that fitted under the front capping and the front hoop had a flat "foot" on it which was screwed down, thru the capping into the captive nuts underneath
as above with mine as well, though i just had massive wood screws in mine (hooray for P.O.) and no captive nuts, bolted it on instead and tied the back down, job done
do you have holes in the tub capping just behind the back of the truckcab? I think that landys originally built with a full tilt don't have the holes for the front stick of the 3/4 tilt.