This custom Q/R plate is compatible with any Arca Swiss type head (Really Right Stuff; Markin; Kirk). It allows you to remove the battery and/or the SD card without having to remove the plate. I bought these on EBAY from a person who does custom plates. It works on both the DP1 and the DP2. I paid $25.00 plus shipping. I have dealt with this person several times before and recommend him highly. He goes by Chris (Krzysztof) and his email is firstname.lastname@example.org. The plate is made of aluminum and is anodized and the bolts are stainless. I think he as 9 more in stock. You receive two allen wrenches with the plate. Once he runs out, it may take a month or two before he gets them cut and anodized. The plate is light enough that you can leave it on when hand-holding.