You use the same thread size that the pan bolts are, I got my bracket from the junkyard and the two bolts did have regular cap screw heads, the regular pan bolts have the large head with "washers" built in
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Frank W
Gen X Member#22 (MA)
73 Malibu Coupe
http://hometown.aol.com/folingo/myhomepage/auto.html
Mighty 305 Power
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Frank W
Gen X Member#22 (MA)
73 Malibu Coupe
http://hometown.aol.com/folingo/myhomepage/auto.html
Mighty 305 Power