I fogot to mention that the above spacers help minimize the amount of the firewall you have to grind away for muffler clearance.

Now the anit-rotation pin...

I don't ahve a manual so here's what I did:

1) Cut away the covering from the bottom of the fuse just under the anti-ortation pin area.

2) carefully pry away the little square pin doubler with a sharp tipped flathead screwdriver

3) sand any residual wood/glue away with a file (I used a piece of 1" wide X 6" long ply with sandpaper glued to it.

4) Looking from the outside again, make a mark 1/8" below the BOTTOM of the existing hole

5) rattail file the hole down til it JUST touches the line you made, then install the pin and stabs. pushing the stab down into the new slots you made, measure the center of the leading edge to the bottom of the fuse and make sure both sides are equal... if not... file the high side a touch.

6) Make up two new alignment squares 1" square with 9/64" holes in the centers and apply 30 minute epoxy to one side of each square.

6) Apply vaseline lightly to the antirotation pin

7) Slide the pin into one side of the fuse and then slide one "new square" onto the pin inside the fuse with the flue side toward the fuse. Then slide the other square on the pin to with the glue facing it's fuse side, then slide the pin the other side of the fuse.

8) install your stabs then make sure the pin is pushed toward the bottom of the fuse.

9)Place a couple strips of tape on the leading edge of the stab and onto the fuse to hold it in position.

10) Look inside and press the squares firmly against the fuse sides, I used an open ended wrench to press it.

Double check the stab is still at the "bottom" of the slots you filed then let it set up.

I wouldn't use anything but 30 minute epoxy because if you got hung up somewhere you'd be pitchin' a fit...

Here's a pic of what you'd be lookin' at: