ROBINSON RACING now has 64p spurs going down to 73t and 75t, there had them in stock at STORMER HOBBIES last week, TOWER was "On-Order", and I believe they were available through the normal distribution channels as well, so LHS's should be able to order them. The ROBINSON gears combined with the PRS gives you 72,72,74,75,76 for spur gears... and upto 65 in Pinion w/ PRS and ROBINSON has new Pinions upto 62 or 63