Thanks for your interest.
First, I have a Gen II upper J-box with the bayonet mount and no modifications; it supports SD.
$1200 or best offer.
I'm also parting with my stand's casters. I don't use them. They are the 8" heavy-duty casters with inflatable tires and brakes from Backstage. They are less than a year old.
$225 or best offer (list: $285).
Both are pictured.