You can download the Dometic RM262 parts manual here:
http://www2.dometic.com/76546bd3-dba...1df89b03.fodoc
If your refrigerator door hinges are located on the right side (as you're standing in front of the refrigerator, looking at it) then the lower hinge plate hinge plate is item #5 on page 7. That's part number 2932643030.
You can order it from almost any RV supply store or from most online RV parts sites. It is listed at $19.95 on the Dyer's site:
http://www.dyersonline.com/dometic-b...tor-hinge.html
If your refrigerator door hinges on the left side, then you'd need the hinge plate that's item #4 on page 7. It's part number 2932643048. I didn't look it up at Dyer's, but I'd suppose it's the same price. Add shipping and you're looking at about $30 for either part.
Good Luck.