Jaka as a long time Pylon flyer then you certainly know the advantages of Bubbless and as am I. Also I understand your desire to try it, good for you. For whatever reason controlline traditionlist always seems to put it down and say it won,t work, well balonny it works great.
I also know that they 'Will' fit into a Nobeler, that is because as I posted above the I have been flying mine just fine with a Tetra bubbless for several years now. The only possible difference I can think of is mine is an ARF version and of course yours is not and to be honest I seriously doubt that the outline have been changed. No doubt as a pylon enthusiast you will have plenty of the 5.5 ounce (150cc) on hand and it can easily be measured to see for yourself.
By the way the 5.5 ounce/150cc Tetra bubbless is the size that I have been using a long time in both my Nobeler OS .35AX as well as my Magician OS .40FP.
Good luck and please lets hear of your success