On a 68 firewall pad, the Osborn assembly manual shows to use only 2 of the push plugs for fastening. The pad came with 7 of these, but the holes are not in the firewall to accomodate this many. Should I drill holes in firewall where the prepunched holes in the pad are? Also, does the windshield washer pump bolt to the floor before pad installation or on top of the pad? Sorry for the dumb questions. I couldn't find anything doing a search. Thanks in advance for any help or suggestions.