i got some 306d soft lr cartos in a trade. the box is the same as the 510 regulars bruce sent me on my first order so im assuming the 306d came from here but i could be wrong i guess. anyhow, i noticed quickly that my 510 drip tips didnt fit. i had a 306 atty drip tip that also didnt fit. can someone steer me to where i need to be to get one that will fit the 306d lr carto??? id really like to give them a go.