The Internal Center Fixture is used to support the lower rails of a frame using symmetrical mounts. On some frames you can used the lower engine mounts, center stand mounts, or exhaust mounts. You will need to decide if this fixture will work for your needs. This fixture goes between the rails of the frame. A 6" spacer (provided) goes between the plates and 3" inches of spacer material is provided to make two spacers for the outside of the plates. This will accommodate widths from 6.5" to 9.5". Two "donut" spacers are provided to get 7" of spacing for the Yamaha XS650 lower engine mount to avoid having to make two 1/4" spacers. Comes with hardware and works with both 2"x2" and 2"x3" tubing.
To support a frame from the outside using exhaust mounts, control mounts, or other mounts, see the Adjustable Width Fixture. The Internal Center Fixture can also be used as a base clamp to hold a 2"x3" king post.