i want to buy some lips for some swimmers that are about 5-6 inches, and maybe a couple 4 inchers, but i can't figure out what size to get. does any one have any advice.

I think the high slot lefty1 should suit the smaller stuff just fine, if they are too small then the lefty2 should do the job

Will also depend on the action that you are after, the weight of the plug, width, conditions it will be fished in, and similar factors. When I am working on a new plug, I'll often try several lips in the same plug to figure out which one gives me the action I am after.

Jigman