[longbed67]

like seven one said, there is not enough room for the d2600 in a rectangle setup, d2600's can expand up to 9" with a neutral bag diameter of 8" and the d2500's with a expanded diameter of 8" and a neutral diameter of 7". but if your not going to be putting a big heavy motor up front or looking to run this in the slalom you can get by with the 2500's but you will get a better ride with the 2600's. The cost of the circles and to have them cut is about $25 if you were unsure of cost.