Pretty straight forward install. Remove floorboard then remove master cylinder bolts cotter pin washer and pin that attaches the brake arm to the master cylinder. Remove the nut holding on the brake arm. Then loosen top engine guard bolt but don't remove it. Then remove the two lower engine guard bolts.
Remove original rear brake peddle and leave the back O ring on the shaft. Now swing engine guard forward at bottom giving you enough room to manipulate the new Ext rear brake arm in place. Install pin washer and cotter pin, install master cylinder bolts washer and nut on brake arm (you do not need or use outer original O Ring). Grease zerk fitting on new peddle. Reinstall floorboard and bolts in engine guard.(Note..don't forget to tighten the grease zerk fitting into the new Ext rear brake peddle).
Note... It is very tedious dealing with the cotter pin washer and pin that hooks to the master cylinder. This will test your mechanical patience a little but can be done.
I love the comfort and the feel of this brake peddle on our Tri Glide it provided a much improved feel. Well worth the cost.
Ride Safe All,
Bill G