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Wasn't sure how this would fit my 5.5" centering ring setup, but the traditional coupler lined up perfectly with no gaps. The 7.5" tail gives plenty of room to work with, and the plastic feels sturdy enough for repeated launches. Ended up ordering a second one.

The stiffy coupler made joining this to my 5.5" ring a breeze, and the 7.5" length feels solid and straight. Fits exactly as described once you get the traditional coupler seated right.

The 7.5-inch length paired perfectly with my 5.5-inch ring, and the dual coupler setup gave me flexibility I didn't expect. Assembly took less than ten minutes once I had the centering ring ready. Solid plastic, zero flex during the build.