J-2 Engine in 1:72 Scale for Saturn IB or Saturn V S-IVB stage (or S-II). No guarantee of kit compatibility. Central attachment stud is 1/8″ dia (3.18mm). Scale inlet ducts have short 1/16″ dia. studs to aid in further detailing and/or model mounting.
If used with a kit, modification to the kit and/or part will likely be necessary.