Does the inside diameter make a difference, notice that Recreation Tires have the DW 11' but they are 4/170 and ours are 4/144
That is the bolt pattern for the studs, yes it makes a difference, you need 4/144.
I actually get my Douglas wheels straight from Douglas, but I also get a good discount on them. (Sponsored rider)
Before I got a discount, I have ordered them through Recreation Tires though before, and was happy with the service. The wheels I ordered at the time were actually drop shipped from Douglas anyway. I doubt any of the Douglas online dealers will have the wheels listed on there website, but you should be able to call them and order.
I ordered a set of 11" rears for my 700XX from Douglas last week, but they are currently out of stock, they were hoping to have more by the end of the month.
Doug