Question:

I'm looking for an ORTF microphone mount for my 2 Audio Technica 4051a's. Anyone have any suggestions?

Answer:
Fleming Any dual microphone bar can be used. Carry a protractor and a ruler with you for setup. they are kind of handy to set the mics at 110 degrees inclusive angle and 17cm between capsule centers.
General purpose mounts for using multiple microphones in a variety of configurations including ORTF, XY, and MS are sold as:

Press conference microphone holders

Agreed, what can I do but thank you for making a point I would have let rest, I agree that ORTF is thus defined and that ORFT is only that setup, wherefore I prefer to use the term XY also for spaced cardioids. Most people however do nowadays use the term ORTF as a wording for "any pair of cardioids on a short bar and with any inclusive angle".

Referencing Michael Williams (I hope I remember this name right) 1983 paper "The Stereophonic Zoom" makes it however obvious that as well inclusive angle and distance between capsule centers may require adjustment to suit various intended opening angles for the setup. I have a nomogram for implementing it, with cardioids as well as with omni's, designed by a friend of mine, that would be the nomogram to carry around to get the initial setup fairly right.

For most real world setups involving an audience it is not going to be possible to get far enough away from the ensemble to use the 110 degrees inclusive angle and it will then case a hole in the middle the size of the average hole in a Hollywood movie script.

Most of the time I end up using an angle in the range from 80 to 45, depending also on the capsule distance choice, longer distance between capsules means that less angle should be chosen.

It is mostly about the amount of correlation required to form a good center image, but also about using the off axis properties of the capsule pair to get the groundplan correctly drawn in the stereo perspective, so that rearmost musicians do not all crowd up in the center.