I have one of Ralph's (merlin machining) manifolds. Another member has one of the Chinese ones and mentioned that it does not clear the factory hood, which is somewhat undesirable... I suspect the devil may be in the detail.
That's a question I have been trying to answer, I think merlin worked with deepmotor to produce these manifolds and thus has the rights to sell them through his store. That would explain why deepmotor lists these but they arn't for sale through them, turbo works had some and I imagine ordered a batch from deepmotor with the company logo but they are sold out. You could contanct deepmotor but I think you would need to order a batch, Or hope merlin start stocking them. Its a shame that something like this has to be hard to get as its the easiest to way to get DBW throttle bodies on a VG30dett, being its a r35 gtr aftermarket top half adapted to a vg30 bolt pattern and spacing. All r35 gtr throttles fit, not to mention the mid runner design opens the power band up for the vg and the large plenums would net some horses.