The big difference between the LP grapple and the EA one is that the EA grapple has serrated teeth to help hold what ever you grab better without it being able to slip out as easily. But it is a 6 month wait currently for a EA grapple...
On my old B7510 it was drivers side.
I used the Kubota block heater part # 70000-73274 It is the same thread as the freeze plug.
When my LX2610 comes in a couple of weeks I plan on putting one in it. Not hard to do and cold starts on a frigid day are the hardest thing you can do to a motor....