You might try some engine machine shops but my guess is you're only going to find them by the set,even tough if it were me I'd be thinking one stud pulled loose,what about the rest? Complete set from Jegs is only $33 & change,as T5 said though if you have any old-timey auto parts stores around they may have them in Dorman but you'll probably not have any luck at places like Auto-Zone and Carquest,Good Luck!