I suspect it is probably a cheesy chrome tip like the ones that were so prevalent back in the 80s. You know... the ones that had two thumbscrews that clamped it to the tailpipe. Probably a Chinese knockoff with inferior chrome finish... for $55 with shipping it is probably a waste of about $45... IMHO...

Of course... I am pretty suspicious of a lot of the offerings of this nature made on ebay.