I sent my standard caps back and got a credit that helped take the sting off the deluxe, but I am glad that I traded up. The deluxe are very smooth and well made. They do offer a non locking version as well for $5 a cap less.
These are not the same as the retrofit caps that others have mentioned with the smaller filler neck. They have the same opening as the standards. The difference is that they must be installed during construction. The retrofits are smaller in the neck but are only for those that have built tanks with the original flanges.
Keep in mind that the standards are discounted in a wing kit, so the credit is not full retail. Still better than nothing if you do return them.
Another thing to add to the order is a roll of conduit for wire runs. I wish I had ordered the pre-made pickups...but maybe I still will with another inevitable parts order.
I also just ordered the vents and fuel drain fairings from JDAir. While not required, they are nice and hopefully will shave a .5 knot of drag off.
