Rig-Rite, Inc. built spars for many earlier Pearson models including the Electra up through the Pearson 30's. Much of the Rig-Rite Spar Sections and Hardware for the Areil & Commander can still be found at:
http://www.rigrite.com/Spars/Pearson...3522_Boom.html
If you need a replacement boom, however, you’ll need to use the newer (and somewhat larger) Rig-Rite RR #4025 Boom Section. Of course, none of the hardware from you old #RR3522 boom will fit . . .