hi can anybody tell me if there is two different size bolts which hold the power steering box to the chassis.i fitted a 3 bolt power steering box in place of the manual box but the 4 bolts which bolt thru the chassis from the original box are to thick to screw into the 3 stud power steering box . I thought it was just a straight swap but as usual nothing is that straight forward where I am involved.thanks in advance derick