Hey everybody ....i took my upper control arms off my 66 Bonneville to replace bushings and ball joints and clean and paint . ive got them mixed up and don't know which came of what side . They look exactly the same as each other and do not appear to have any offsets or anything to not allow them to be fitted on either side .BUT when you buy them they have different part numbers  and are noted to be LH or RH ....does anyone know if they are handed and how ! thanks j