A-1 Makes two different sidewinder header designs: one for boxes and one not.
I have the "not" version.
If you're thinking of going with a new header and you want heat, I've got a deal for you. The boxes are ceramic-coated, new never used. I paid $400.00 for them but I'm willing to entertain offers of the monetary kind. I guess I can take some pics if anyone is interested.
If they sell here I'll donate 15% of the selling price to this site.