The inner boot is usually retained with an "earless" type clamp. This is a low profile clamp. The ones you see on the outer boot are the standard type and will not work on the inner because of clearance issues with the transaxle case.
Get the earless type pliers or rent them, you will need them.
What do you mean by grommet? Also if the joint poped out make sure you get a new axle retainer clip.
