ive go a 84 280e that in the process of cleaning my alternator I lost one of the 2 black plastic lower bolt bushings. they look like an abe Lincoln top hat. I have not had any luck finding any. where can I get some. I tried to use a bronze door hinge bushing but the inner diameter is a tad bit to large. im in the usa so its not lie I can go to the parts store to get some. I figure they have to be used on other models or engines.