Sourcing crystals for a G2DAF receiver

[Guest]

Dear All,
I have a colleague who wants to build a version of the G2DAF
receiver which needs a set of crystals with unusual frequencies. The
ones on his list are;

Freq/MHz Category
======== ========
7.0 Fundamental
9.0 Fundamental
12.5 Fundamental
19.5 Fundamental
26.5 3rd Overtone
33.5 3rd Overtone
34.0 3rd Overtone

The only one I have managed to source so far is (a very close match
for) the 9.0MHz. Short of having bespoke ones made up, which is going
to be relatively expensive, I wonder if anyone knows where he might
get these items?

Many thanks
Tom Crane

Ps. The email address in the header is just a spam-trap.