OMFG, FUNNIEST EBAY REPLY EVER.
I say, they don't fit, send me measurements of a replacement so I'll know they fit.
Customer service then replies with this:
We actually found a forum post that we thought you might be interested in checking out. Let us know if it'll help you in any way. Thanks!
Feel free to contact us during our business hours at 626-965-8898.
Monday - Friday, 9:00am - 6:00pm PST (Except for holidays)
Essentially admitting that these headers do not fit, and I should go ahead and try to bend them to do so.