[Healeys] Manifold drains

[Ray Juncal]

List   I'm still working on those carbs.  I need a source for the drain
fittings on the bottom of the intake manifolds.  It has a 1/8" tube
compression fitting on one side and what looks to be a 3/8"-26 thread on the
other, where it screws into the manifold.  Is that a "British straight pipe"
size?  If so I could modify a US 1/4" tapered pipe thread fitting with a die
of the correct thread.  Any ideas guys??RegardsRay Juncal