looks like no other option but to order the NTM Prop Drive 28 Series Accessory Packs from Hobbyking. Sticks in my throat a bit paying £4.80 for the goods and £5.18 for the postage!
I have 3, maybe 4 (not sure where the 4th motor is) NTM 28-26S 1200KV 'Accessory' packs I'm not using as I won't use NTM motors again after too many mysterious failures :S I can post them out to you FOC if you Trust me an address (I'm sure I have the 4th somewhere, won't have thrown it away just don't know where I've put it...[Old age])
Just the prop adapter and the 3x M2 allen attaching screws for them you need right? I don't have the caps sorry, slung those, too heavy and useless to keep, better to use locking nuts anyway, I'll add locking nuts if you need them too, just let me know.
EDIT Found the 4th one! It was in my huge pile of 'To do later.... maybe' things. Let me know if you want them!