Ryan. .
Rob has above posted the PDF files for the Case tractor they come off of for you. Find a Case tractor dealer nearest you and you can get them. I will not post a price on them as I do not want to upset Robin as I promised to behave for her. They are more expensive than the breather only one you can make fit,but,they are well worth the money.
As for polishing them,they did not polish well and for some reason even after endless hours of working them they just didn't look right. I would imagine it because of the way they are made or cast and possibly have some other metal in them for strength. They looked about two shades darker in color than my factory ones which I had on that were polished. My polished set is laying on the workbench,along with the polished air horn collecting dust. I should sell them but being the packrat that I am they will probably end up in the "I may need them someday" crates in my storage area,LOL... ... Andy
Here is a shot from my Spring Fling show. As you can see I had already had them painted and clearcoated and was awaiting the front and rear covers to be done. I am glad I went back and took the polished ones off,I like the painted look alot better. It also had the AFE Stage 1 system on which I later sold.