Hey found this storie of a local guy that converted this machine and uses it for pumpkin seeding, here you go
Province Rewards Agricultural Innovation
WINCHESTER, BELLEVILLE - Stephen and Valerie McDonald of McMaze-Cedar Fox Farm just north of St. Andrews are literally reaping the benefits of their innovation.

Stephen McDonald modified his International 400 Cyclo series air corn planter so it can also be used to plant sunflowers, gourds and pumpkins, among other crops.

He spends less time and money planting even though he now plants more acres to meet the growing local wholesale demand. And yield is up on those acres. All in all, it’s an improved farm practice that boosts his bottom line. Innovative ideas grown by Ontario farmers are contributing to the local economy, boosting the agri-food industry and offering more choices for the consumer.

I'm sure if you would like info on this I could track him down. dan_boisvenue@yahoo.com