After two years checking eBay almost every day, finally, this past June a Harly came up that I bid on.
Would like to have found a place to buy a good used unit at a reasonable price right off the bat...no such luck.
A used Harly Rake is like a used Vicon Spreader...very hard to find, and even harder to find a good one at a good price.
My understanding is that both the older bar (fret) style roller and the peg style are available from GlenMac...customer preference. I don't think the peg style was necessarily intended to replace the other. I believe the two style rollers are interchangeable. The folks at GlenMac are easy to talk to if you have questions. Phone number is at their web site.
OkieG