Hey guys I'm posting for an older friend of mine without a computer. He has a 1978 Dodge Magnum 9k original miles with two speed wipers that quit working. Upon inspection of the wiper motor we found some plastic pieces literally that turned to dust..We found a new re-engineered ? 75-79 B body wiper repair kit on ebay that best we could tell were what his used to look like before it turned to crumbles..The kit came with no instructions but after looking at the pieces and the crank arm it looks like maybe this repop kit is for 3 speed wipers. Is there anyone familiar with this issue and is there anyone that makes the plastic cam and other pieces for the 2 speed wipers? Sorry for being long winded and thanks for any help!!

Steve