(1) A manufacturer participating in an independent plan may join the standard plan by notifying the authority and the department of its intention at least five months prior to the start of the next program year.

(2) Manufacturers may not change from one plan to another plan during a program year.

(3) A manufacturer participating in the standard plan wishing to implement or participate in an independent plan may do so by complying with rules adopted by the department under RCW 70A.500.230.