I've bought car parts off ebay without any kind of problem.
Remco

The mantra you should always be using is, "if it sounds too good to be
true, it probably is." With eBay, it's hard to say how reliable a
seller is, even using the feedback system. It all depends on the
individual seller; does the listing seem sketchy to you? Do they offer
a 100% guarantee on the part? Is it some guy selling it or a reputable
eBay store?

I haven't seen the listing, but if I were you, I would pass unless it's
an obviously watertight deal.