i like those brian, can you post the manufacture and item number?
IMCO is the manufacturer. www.imcoweb.com . I gave you the pic so you can gauge the look, but I wouldn't recommend these exact tips since they have rusted a fair bit around the rim of the tips, and I have to spray them about 2X a year now to fix it. CrazyJoe had a sweet lookin set of tips that looked better and I think Boosty has the same ones too that they both got off Ebay.
It is so easy to clean up the aluminum I would never chrome them. Be very careful not to extend them too far or they will scrape the ground when going up steep driveways......and if they are chrome they won't be easy to clean up after that.
If you drag the aluminum, you can file it clean and buff it shiney again.