Where can you buy replacement parts for a Dearborn 14-15 Cycle Mower? I tried EBAY but the selection was slim. I can only find blades and rock guards. I'm looking for a 141029 guide ass'y and (forgive my ignorance) the bar that the knives mount to complete with the head that connects to the reciprocating arm, which I believe is called the Pitman arm. I believe the part numbers for what I need are 142670 knife head with the 141111 Knife Back if I'm looking at the drawing correctly. I would also need the necessary rivets. Any info is appreciated.