OK - STATUS REPORT.
So I got those cans/belts I ordered from MG34.com... MAN are they nasty! Someone repainted a few of them with an ugly playground-swingset-green using a thick, thick brush. There are bristles stuck in the bottm seam of the cans, and the pain has frozen the dust cover's feed door and spring. NO JOKE! I can strip them down but it was kind of amusing to see them that way.
In comparison to my Hungarian cans, these have no "bullet points this way" embossing, the canvas straps are stretched out a significant amount, and the overall condition is "beat all to hell but still serviceable".
They still have the 250- and 100- round can/belt combo listed on their site. So for now at least, they are the only ones I know of that have them in stock.
I called ORF today and they have nothing for PKMs at all.
I found the "wide" strap that, according to pics in the AA-OK.com gallery, is in fact an E. German PK strap. I ordered one, so we'll see how it looks. It appears the E. Germans didn't put that pad on their straps.
Oh and at one time, http://www.winslowarmory.com/ had PKM buttstocks. They looked brand-new from the pics. I don't see them right now, but perhaps they'll get more in soon.
Stay tuned, more to come!