If your actuator has the factory bracket on it with no backing plate welded to it, then it's for a stock TA series turbo. If you actuator does indeed have a backing plate bracket welded to it, then it might be the wrong backing plate bracket. In the past, there were three different styles of backing plate brackets used. I believe that PTE has commonized this, with their newest compressor covers.
I can't stress this enough times, whenever anyone orders a wastegate actuator from any of the turbo vendors, you must be 100% clear on which compressor cover your turbo has. TA style, TO4E, TO4S or H cover. This determines which backing plate clamp gets welded to the actuator.
The backing plate clamp gives the proper bolt hole spacing.
In some cases, you might be able to redrill the holes, and or use washers.
HTH
Patrick