Examples of prefix and suffix components of typical part numbers:

A2938
A = Adapter, 29 = motor size, 38 = motor tube size

RA29L
RA = Retainer Assembly, 29 = motor size, L = motor tube type (per lists below)

RB38P
RB = Retainer Body, 38 = motor size, P = motor tube type (per lists below)

RC54
RC = Retainer Cap, 54 = motor size

RA75
RA = Retainer Assembly, 75 = motor size, no suffix indicates a flange type retainer

TA3830LA
TA = Tailcone Assembly, 38 = motor size, 30 = airframe size (3.0”), L = motor tube type (per lists below), A = Aluminum finish

TA5439PB
TA = Tailcone Assembly, 54 = motor size, 39 = airframe size (3.9”), P = motor tube type (per lists below), B = Black anodized finish

TC7539A
TC = Tailcone Cone, 75 = motor size, 39 = airframe size (3.9"), A = Aluminum finish