The 81032 - Lower arm shaft is used in the following:

Exceed R/C - Razor
Exceed R/C - Tectonic
Himoto - RANCHO
Himoto - RANCHO PRO
Himoto - RANCHO UPGRADE PRO
Amax - Maxiva
Amax - Boom Wheel
Amax - Berserk
Wind Hobby - Pan Golin
Redcat - Avalanche XP
HSP - Bazooka
HSP - Tornado
HSP - Rattlesnake
HSP - Copperhead
Amax - Monza
Redcat - Landslide
Himoto - Mega
Himoto - Mega Pro
Wind Hobby - Salamander
Exceed R/C - Titan
HSP - Copperhead
HSP - Rattlesnake
HSP - 94084
HSP - Tornado
HSP - Bazooka V2
HSP - Bazooka

The 81032 - Lower arm shaft may also be used used in other models please refer to your instruction manual for the correct part.
Actual product may vary from picture.