You will have to drop the skid to get new bolts in , I just had to pull a stirrup off mine to weld it up and I had to drop the skid but could reach with the track, drive shaft in place.... just used a cold chisel to remove the rivets and it only took 10-15 to remove , and about the same to reinstall.
I used 1/4 bolts for the upper two holes and 3/16 steel rivets for the rest.
Honestly the skid is the hardest part of this.