The 130mm travel setting uses two 30mm spacers but one of them is *already inside* the fork, on the plunger shaft inside the left (spring) leg. It sounds like you're adding a third one… :-)
The spring-side spacer has to be re-positioned, so you need to remove the plunger shaft by undoing the nut [1] at the bottom of the fork leg (catch the oil as it drains) and pushing the plunger assembly up through the stantion.
Take the spacer off, and put it back on top of the spring just before re-installing the topcap. (Remember to refill with oil…)
On the right leg (damper side) you just undo the topcap and clip the second spacer onto the top of the shaft.
No need to take the lowers off.
[1] That nut can be a pain to remove (and re-tighten later) as it's prone to spinning around taking the plunger shaft with it – in which case you need to re-assemble the upper and apply some preload or tie the crown down to the fork brace. The force through the spring holds the plunger in position and stops it spinning round.