Looking for 32.768MHz OCXO for BS-11 calibration

Hi!

So for everyone who has problems with BS-11 clock accuracy, what would be the theoretical straight-forward way to solve the problem, is to replace the 32.768MHz crystal oscillator on the E1 card with a OCXO of the same frequency.

So what we're looking for is an OCXO with +/- 0.05ppm or higher stability for 3.3V power supply. Unfortunately I was not able to find one at that frequency, even digikey doesn't have one.

If anyone can find a source for a OCXO in the abovementioned parameter range (and small quantities), I think quite a number of people would be interested in buying one and connecting it to their E1 boards. Any help is much appreciated.

Thanks!