Coil needed for 1947 Firestone 3.5 hp

[ronad]

My mageto is an Eismann model 61M. I don't have a manual so I don't know the part number for it. Is there a cheap Chinese replacement that can be used to switch the winding onto the existing laminate centre spindle that is 5/8 in X 5/8 in?

 

[brim_buster]

I think I took an OMC one and did that but dont remember if it was my Firestone. Here is yours which looks really similar to my 7.5