I haven't seen any and don't think there are any. Best bet is the delrin drip tips from Nhaler and elsewhere. The long ones feel much like the flat tips. You can also remove the end piece and silicon ring in the carto and cut a 901 flat tip to fit. I did that before the drip tips.
Added bonus with the 901 tip is that you can put some poly fill in it, use a needle to burn a hole where your lip would cover it and now you have a double capacity carto
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