Judging by what I'm reading in the Jan 2016 wholegoods document the answer is that it needs a Mid-Gear (L8316, $248) when it is a ROPS model.
I believe installation of the gear requires the tractor to be split to install, but not 100% certain.
The Mid-PTO (L8387, $377) is very easy to install if its anything like the installation on a Grand L30.
The note for the Mid-PTO Internal Gear Kit states:
For installation of L8387 Mid-PTO Kit, L3560DT/GST/HST, L4060DT/GST/HST, 4760GST/HST, L5060GST, L5460HST, L6060HST (Standard on Cab Tractors)
If you send a private message with your email, I will photo the page and send it to you read first hand.
Since this document is 2 years old the information might have changed.
Hope you find this useful.
Good luck and please report back what you find and do.