DD 15" basket mounting hole spacing?

[JackalAR]

Would anyone mind checking the spacing from center to center of the mounting holes on a DD 15" basket and post the measurement along with model and basket option? DD doesn't have or provide these specs. I wouldn't mind hearing a few non DD measurements as well for comparison. For instance, this RF P3D415 I have sitting here is exactly 15". Thanks!!!

[DbDesigns]

should be the standard pattern...

[JackalAR]

Thx...more worried that my RF P3 isnt standard than so the DD. Then again, I dont know what the standard measurement is and dont have another 15" to compare. Any help appreciated!