you can add a top plate spacer, or make one, up to about a ¼" thick without needing any extra bolts. the tundra+5100 coilover assembly is actually longer than the stock coilover so adding a top plate spacer would do no more harm as long as its doesnt make the assembly longer than the tundra assembly.
basically put the front up on jack stands, take the wheel off, remove the bolt connecting the shock to the lca, then remove the three bolts that secure the top plate, put the spacer on top of the top plate, then reassemble, and get an alignment.