Parts book doesn't show an end date but looks like the 50year run on the 258 has ended, parts book shows a start date of 7/67 and I think they were still made in 2017?
I read some buzz recently that single Rolabar rakes were discontinued but haven't verified that info. Certainly wouldn't be a surprise.
Toured the NH plant in the late 1980's and saw robots welding up rake (non-dolly) hitches at that time.