I cannot think of any reason why you couldn't use square tines as long as they fit securely and as you noted, are the correct length.Any reason the round aluminum feeder tines can't be replaced with the older style square aluminum tines found on other hayliners? The bracket fits the tine bar, although I have not checked length.
I will definitely try this Mike, thanks. I'm guessing this may improve flow and uniformity?I would use the tines the 315 uses. On the 315 and later balers the squaare tines are mounted about 5” from the round tines.