FYI There is a used PT1850 on Ebay. Do not see these very often. Been stored outside from the looks of things. Price seems high to me for sight unseen.
Search ebay for "power trac 1850" and you should find it.
It has a bucket, forks and stump grinder, dual tires.
Also, someone was discussing a bucket level indicator for their PT.... this one has one, so go look at the pictures. Something could be duplicated easily from the pics.