Welcome to our group, welcome to vanning, and welcome to America!
I was going to guess you were from the UK, but then I saw your introduction post.
"Breakers" gave it away. LOL We call them junkyards and salvage yards here.
I don't know if that lower control arm from the C10 is interchangeable, but that information would be handy to know.
Lowered spindles for a C10 work for our vans, and here's a good thread about it.
(Photobucket just made some changes, so we've lost a lot of pictures around here)https://www.vanning.com/threads/ubbthreads.php/topics/213368/1