I'm new to the forum. I have a 1978 Chevy C10 shortbed, 350. I'm replacing the upper control arms, tie rods, pitman and idler arm. After removing everything I started looking at the lower control arms. They are in fairly good shape. But I was thinking while its apart I might replace the lowers. I can't find new replacements except for "tubular" which are very expensive. So my question is are the C20 lower control arms interchangeable with the C10. I'm sure they would heavier but I would think the dimensions would be the same.