I believe the name of the gentleman in Crawsfordsville you are refrring to was Fred Ropeke. Hope I spelled that right. He had a museum there. He passed away a year or two ago. The museum was kept in tact for a year but I don't know what it's status is now. I know a few individual collectors with assorted parts. Don't know any dealers.
You might go down to the Miltary club section. IMVPA. Indiana Rustbusters. PM Mash-4077. He may be able to help you out.
AOPA ( 43 yrs)
EAA ( 43 yrs)
4th Inf. Div. - 2nd Armor Div. - CIB