i found the 3/8 24 x 1/2" bolts at a bolt supplier that was open from 8-10am today. I got there at 9:45.. thats after going to 5 other stores.. but atlest if i ever need a hard to find bolt ill know where to go.. this place was a 500,000sqft warehouse with rows of racks stacked to the ceiling with nuts and bolts.. and that was 1 of 3 buildings of nuts and bolts..