When I changed the ram sleeve to the 2k5 ram sleeve, the barbs weren't fitting to easily on the 2k5 ram sleeve. Same went for the 2k2 front block. Fortunately I had bought a small parts kit from T. Foolery that had timmy barbs. I also bought the hi-flow barbs but haven't installed in the NME yet but I would imaging them fitting without any problems as they were made for timmy parts. You may have trouble fitting the NME barbs on the timmy parts and risk stripping the threads.
I think the NME barbs are slightly larger than the Timmy barbs.