VEVOR Pallet Forks, 907 kg Clamp on Pallet Forks, 1090 mm Total Length Tractor Bucket Forks with Adjustable Stabilizer bar, Heavy Duty Pallet Forks for Tractor Attachments, Skid Steer, Loader Bucket

1)we have a New Holland Boomer 25C with a 4 in 1 bucket will these work in our bucket. 2) do they come as a pair or do I need to buy 2 3) do they need vertical bars as well.