4-speed pedals Heavy Duty

Such is true but you need the spring if you use a real clutch.

That's just not true. You're spouting bad information. Clutches have come a LONG way. There are plenty of good diaphragm clutches. Perhaps some even better than the Borg and Beck. You're comments are going to make it more difficult for him to sell his setup, and the comments have no basis in fact. I suggest you read up on modern clutch design. This is a nice, hard to find set and does not need the spring as long as you run a quality diaphragm clutch and there are plenty to choose from. Get your facts straight.