Sorry for the advertising, but I started a business for making race suspension setups. I have a lot of nice new products for making special arms to any car. See my website
http://131abarth.com/shop/uniball/fi/ where you can choose from many languages for buying stuff from top of the page. Most of the products have english explanations, not all though, but you can allways use google translate. The payments can be done in several languages.
I can make forexample 131 rear suspension arms from CroMo tubes with rosejoints really easy. I have tig welder with root gas systems. I have welding rotator for tube weldings, automatic bandsaw and lathe + milling machine. Most of the stuff is done in Mori-Seiki milling center (I buy the service) but for special modifications I can make the stuff myself in small series. Some pics of the stuff I have done:
Toyota Starlet four link (front suspension coming)
Volvo 240 race front suspension prototype, will be ready soon.
Toyota Mr2 rear steering arms (complete setup for Mr2 coming
Opel Astra rear axle support
And so on. Fiat 131 rear arms are really easy to make if you need some. I will make some HD versions for std bushes later.