Are you able/willing to share your harness guy's contact info? Are you sharing "Jaye's harness"? I'd love to put together a trip to PA's Amish country since I've done so much up in OH's Holmes county around Millersburg.
Maybe someday soon? Don't know when it would be - on my wish list right now... When I do come that way - I want to visit companies that have draft farm type equipment too (have some contacts for that - though haven't talked to anyone yet) such as White Horse. Not sure they are in the same area of PA that you are, though. There are others, don't have my "little list" handy right now... May have to create another as I'm not sure hwere it's at. I need to check - Horse Progress Days is held in July and should be held in PA soon.
And you never know - someday again - I may be able to do more purchasing - ie: special order(s), LOL.