Will you be supplying a engineers certificate with them and do you have a valid product liability insurance policy and do you hold the appropriate welding qualifications to modify suspension components? This is why the maddat ones are the price they are, do you realize that if your modified component fails and is the cause of a crash/fatality you can be held liable and be sued for everything you own? Again this is why things cost what they do . Sorry to put a downer on your business venture but you must think of all the above if you are going to charge money for your parts