Here is a good used APEX EX754 Impact Adapter. This one is 1" female drive to 3/4" male drive. Retainer holes in it are 7/32" and 17/64".
TZTOOL TZ600 COMPACT AIR IMPACT WRENCH with 3/8 IMPACT ADAPTER
Titan® Quick Change Impact Adapter
1 Sunex 5303, 1 Inch Drive, 1" Female x 3/4" Male Impact Adapter, Cr-Mo reducer
WHITE-USA Lineman 1/2" DRIVE QUICK CONNECT 7/16" HEX SOCKET IMPACT ADAPTER
Snap On Tools 1" to 3/4" Impact Adapter Reducer Socket Tool GLA124A
SK Hand Tools 46186 - 1/2" Female - 3/4" Male Impact Adapter with Ball Retainer
