Which model of straight cut header will fit our 77 L2? We use the combine, for wheat, barley and canola and do about 400 acres per year. Currently the header on the machine is equipped with a pickup for swathes. By the way speaking of pickups, whats with those wheels? The way they are mounted about all they are good for is checking the pickup height when you are moving, since they aren't mounted strong enough to actually hold the pickup up?