Whats the difference between these frames?Are the dimensions different? How do I tell if the motor mounts or any other parts that I have are for a seamed or seamless frame?.
It depends on where you are measuring. I just measured both frames, and the distance between the two rivets on the crossmember is exactly the same at 24 3/8". The width between the frame rails at the firewall is almost exactly the same at about 29 1/8" on the frames I measured.Seamless frame is narrower then the seamed frame.
How to tell if the parts you bought are for one or the other? Unless you have part numbers........... not easily is my guess.