@ Darkness2abyss: your pictures aren't displaying. Can you clarify or repost?
I would have replied earlier, but my computer had some issues that kept me off the net for a few days. According to the vendor listings I can find, the hose that comes with the 150-7 kit has a 1/4 fitting on the compressor end. So you'd want the one in the Amazon.ca link I posted above.
The one Maple Art suggests is the same, only it's BSP on the 1/4 end, while the one on Amazon is NPT on the 1/4 end (they are both BSP on the 1/8 end). The difference between NPT and BSP is that NPT has tapered threads, while BSP threads are straight. Otherwise the thread size/pitch is the same, so NPT and BSP fittings are cross-compatible (for airbrush use, at least).
The one on Amazon.ca will do the exact same job for much, much cheaper. I'm sure that's not Maple's fault, but rather some kind of import cost + economy of scale issue. One's made as a general-application pneumatic fitting, the other's made specifically for airbrushes, but underneath the marketing demographics they're basically the same item.