The 5702-95-30 is referring to an AN4 ID washer with a 0.753 OD that Van's provides with the kit using that part number. There is one placed on each side, with additional AN960-416 AND/OR AN960-416L washers added to fill in the remaining gap.
As I recall, getting these in was difficult but I didn't have the washer wrench set at the time. I've since bought one and it does help a bunch. At the time, I took a very fine thread and passed it through the 5702-95-30 and the AN960-416, tied it to the washers, and used the thread to lower and maneuver the washers into the space with one hand while slowly pushing the bolt through with the other once the washers were in place. A very frustrating but eventually successful process.
You can use the above method for now, but buy a set of the washer wrenches for the future difficult installations - You'll be glad you did!
RV-10 Finishing Kit & FWF in-progress
2018 VAF Dues Paid