was looking for a used rrs or kirk plate for 5d2, and realized that markins now makes an L plate for 5dII and nikon 7D. Can buy it directly from them or from ebay. I payed 130 through ebay shipped. so far looks very good and fits tightly. As you know, Markins makes very good ball heads, and I am using this with a Q3T ball head. the rrs plate would have cost me 157 after taxes and delivery charge.
If people are interested, I can post images of it, on 5d2

