Any seed supplier should be able to help unless they just don't have any small seed beans.  Be aware seed count does not necessarily mean they will work.  There can be big and small beans that give that average count.  They need to go through the sample screen that came with your meters. When we ran the CIH 5400 with SI belts I was a bit infamous at Beck's office for a while.  We'd had a problem with the first beans I planted so before next year I talked with Becks and SI, and SI sent them a sample screen.  We had 3 varieties on order and I specified they HAD to pass the sample test.  When I refused one tri-axle load and only took half the other it got their attention.