47-59 Interior trim question

[mrbuck]

I’m starting to layout door panel and interior upholstery. I want to do 2 tone with the majority tan and a quilted diamond accent section. Instead of just seaming the two fabrics I like to use a chrome, polished steel,aluminum trim strip separating the 2.
My problem is where to find 1/2 round trim. I think I’d like use 1/2” to 5/8 wide 1/2 round. Does anyone have an idea where I can find something like this. I already check my local steel fab shop.
Please help.