For the clutch side, check with your local shop and see if they can get emgo parts- they make levers,oil filters,grips and all sorts of cheap aftermarket stuff.Ask the dealer if he can get EMGO part #E34-73507, this will unfortunately only fit the clutch side,should be under $1.00, yes one dollar.I have unfortunately not been able to find one that will fit the front brake side this is a standard 8mm lever bolt but the shoulder part the lever pivots on has to be slightly longer for the increased thickness of the brake cylinder and if you install the same bolt as the clutch side it is to short if I remember correctly.I will check my friends kx this weekend to see what the difference is.
Honda has the same size bolts as I recall,8mm, might want to try and see if the bike shop might have one in stock to compare it with.
If all else fails go to a bearing shop and get a oilite bushing with a 6mm inside diameter and a 8mm outside diameter,measure the length of the shoulder on the original pivot bolt for the length of the oilite bushing and just run a 6mm bolt with a small washer under the head thru the bushing and out the bottom of the perch and install a locknut on the bottom,works just as well.