The only one-piece adapter I'm aware of is the
AEA-TA1 (about 4/5 down the page). I vaguely recall someone posted another one here on ts but I don't recall who posted, who makes the adapter or where on ts the post is.
The above is rather expensive. You'll save some money by using a 1/4>3/8 then a 3/8>5/8 adapter. Both can be had from B&H photo cheaper than the above one-piece.