I bought my grease, Mobil Lith Moly EP2 directly from the Oil distributor, $18.05 for a case of 10. I use it for both the M105X and my KX-71 excavator. Meets or exceeds Kubota spec's.
Also, got to the website of the brand/spec you desire, and they can get you in direct contact with the local distributor (not retailer). That's what I did with Mobil. It saves time, money and hassles!