Looks like the original studs are cut short and a threaded adapter lengthens the push rod to make up for the extension of the booster into the engine compartment.

I am wondering if DGV to manifold adapter plates could be used as the concept is similar for coupling carbs to manifolds.

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So it looks like it adapts an S14 - GTR brake booster? I'm just guessing from looking at the link and seeing S14 and GTR in the write up.

yes but it is the underlying concept of the adapter that can be adapted. Model does not matter.

Beats drilling out firewalls.

Wish I would have known, I drilled mine.

Well you saved $300 if you would have bought the one in Japan.

Their are some nice parts if you want to spend the money, and remember shipping is not cheap from Japan. By the way if you want to read the site use a translator add on, like I did.