I am looking for some help locating parts for a Oliver Superior grain drill.  I am not sure of the model number, but it is on rubber and 12ft.  I am looking for the seed tubes (both for the oats/grain and the grass seed).  The oats/grain seed tube is about 1.5&quot; ID on the top and about 1&quot; OD on the bottom and about 16 inches long and appears to be made of spring steel.  I do not have measurements of the grass seed tube.  Any idea where to locate these?

Thanks in advance!!
Mark