Be careful, the bodies come in two main styles, the type you have which mounts with two diagonal points and is a bit bigger in size, and then the smaller 'microswitch' type (pictured above) which is normally used under the playfield for lanes or on the playfield for gates.
You need to find a switch body that matches yours, and when I looked at Marco, ALL of the bigger bodies were also sold out. PBL or Cointaker might have something closer, and then you may be able to move the arm to the new body.... carefully!