I have a UM2 which is not a "Plus" or "Extended". All the replacement extruder tips I can find indicate they are for the UM2+ which I do not have. I see there is a "UM2 to UM2+" upgrade kit but it includes other things I don't want (eg. extruder drive motor assy because I already got the Bondtech QR extruder assy) and anyway the UM2+ upgrade kit is apparently no longer stocked by "MatterHackers" (I am in the US). Do I have any reasonably-priced options to just replace the 0.4mm extruder tip itself?