Hey Guys,

I think the 78 has the same exhaust dimensions as the Eagle 60 series I. Take look at the link I have attached and you will see my Eagle 60 with a Super Tiger muffler attached. Took about 5 minutes with a Dremel to match up the ports in the muffler. I also put #6 screws in the original mounting holes to locate the muffler. Your 78 may not have these but it will work without them. If you have any question just let me know.

Kent

http://www.flitelinesolutions.com/eagle1.html