It looks original to me. But the machine has been painted at least one time by previous owners. I asked about it to the person at Power King Tractor. They did not get much info about accessories when then bought Digit.
Haven't been on this thread in a while. We did the re-power our 158 with the 22 HP Predator engine. It was a close fit height wise but it worked out well. Pictures attached. It isn't this pretty anymore. I've done some work with it the biggest of which was a drain system around the basement of a rental house. I had a neighbor that kept coming around in awe of how capable of a machine it is.