I ordered a tail fin rack without checking if it would fit my bike, (which it didn’t) but with a minor bit of filing on the axle I got it to fit a treat.
Had a test ride and really impressed with the rack, very sturdy and does what it says on the tin. Thanks.
I tried several different packing methods over the years starting with panniers to bikepacking backs and also backpacks. Overall the system from tailfin seems durable and stable enough for my longer trips (2/3 month's).
The seatpost connector is giving the system more space and makes it easier to open the bag when it's connected.
I ride a size small gravel bike with a tall seat tube angle and am very glad I took the advice to add this extender. It gives more room behind the saddle which makes the Tailfin AeroPack much easier to pack. It also would leave more space for strapping items on top of the Tailfin rack.
My only complaint is I wish this were a no-cost option when ordering. I don't need the standard 50mm connector, so it'll just be sitting around in the garage unused.