Don't forget that you are in the USA and in accordance with the FCC regulations YOU are not allowed to change crystals in any RF module.
What you would need to do is send the module and the crystal that you want to use down to Horizon where they will fit and retune the RF to that crystal frequency.
How strange that here in the UK, we can pop crystals in and out of the modules all by ourselves, mind you.... thats a good job otherwise I would be inundated with module retunes !!!!
[:-]