Esoteric D70 modifications to accept G25U clock

I have an Esoteric D70 to go with my p70 and bought an Esoteric G25U at the same time to use with them. I find that the D70 can only be used if modified. Can anyone help me with this? What is required and where can it be done.
You should contact

TEAC America, Inc.
7733 Telegraph Rd.
Montebello, CA. 90640
Phone: (323) 726-0303
Fax: (323) 727-7656
contact: Tim Crable, manager technical services