Ok here is what FT generic 8ml silicone bottle looks like in P67,,, next to the mod is a old style needle tip 10ml bottle 1) yes the bottle fits but it semi bulges,,, 2) that needle tip also fits my 100+120 ml bottles,,, if I chose to go the path of using the bottle design of the fill port.- if you go with that plan,, you will have to really pay attention to how you position the bottle for finished placement of the port hole.
Note about tubes,, I used my 3.0 coil jig to slightly stretch out the tube (all tubes) to fit in the REOS metal stem,,, 3.5 might work,, ???
Overall I happy to have 8 mls,,the soft silicone is also a major upgrade,,, I also decided to give 1 more 510refill system a try,, others have not worked out well for me,,, so I'm trying out the
Vandy Vape Pulse X Replacement Refill Bottle,,,, meantime if all I have gained over my little Nudge silicone bottle is more volume,, then I am happier. I know most people like tube designs,, but I was happy with Pico long metal stem with a plug system built in.
Edit note- if you don't like the fill port aspect of this bottle,, take off the center collar,, then twist the base so that the fill port is blocked full time,
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https://www.fasttech.com/products/9658497
https://www.fasttech.com/products/9664168