Get one of each for reference sake(long and short bolts) and go to a bolt/nut supply specialty shop. Get atleast grade 8 hardware or whatever the OEM stuff is. I bet you can get what you need for about $10 or less.
2005 Ford F150 SuperCab FX4
1964 Chevrolet Impala SS
1998 CSVT: 354HP/328TQ @ 10 psi, now gone
