Can you tell us more about the Kubota K-PAD, RS?
Best parts system I've found so far is the Messik's web site, and it leaves a lot to be desired...:grumpy:
Just a guess, but I suspect that K-PAD is the backend to what Messicks offers on their website.
Unlike Messicks, K-PAD doesn't require any signup, login, or email address.
K-PAD does not like Apple's Safari browser and gives a warning message when you try and access it with Safari, saying it is incompatible (which is not exactly true) ... and that it will support Safari in a future version "soon" (it's been like that for several years ... so, yeah ... sure ... "soon" ...

)
You can use Safari to access it however (at least Safari version 12.1.2) - but it's a little tricky. You have to turn on the "Develop" menu in Safari (under "Advanced Settings in Safari 12.1.2) and then set the "User Agent" (under the "develop" menu) to something else other Default (Automatically chosen)
I typically set it to Internet Explorer 10.
Once you have done that, then open the following link:
https://apps.kubotausa.com/illustrated-parts/
Once you have done that you'll have to navigate thru a few screens, agreeing to TOS and disclaimers, but any new tabs that are opened as a result of you clicking on links should open successfully finally landing you at the model look upon page:
Initial K-PAD page:
Disclaimer/Terms page:
Model Lookup page:
From there you can search for and select a model ... and then drill down into the specific sub-system you are trying to find parts for.