There is a standard for what they must include but not where they are to be found. The standard simply states they they be "available". According to order 8110.54A the "document XYZ" must be available to you and must include the following:
10. Component Overhaul Manual or Section. If the aircraft, aircraft engine, or propeller maintenance information references the use of a
component overhaul manual, or specific section of a CMM, as the
appropriate location for the ICA, those applicable instructions are
incorporated by reference and become part of the complete set of ICA.
If component overhaul manual information was developed to comply with
14 CFR § 21.50 then the component overhaul manual, or referenced
section(s) are part of the ICA. As part of the ICA, it must be
furnished to the owner and made available to any other person required
to comply with those instructions per 14 CFR § 21.50. This manual or
section must contain the following information:
a. Cleaning and
inspection instructions that cover the materials and apparatus to use
and methods and precautions to take during overhaul. These
instructions must include methods of overhaul inspection;
b. Details on all fits and clearances for the component relative to overhaul;
c. Details of repair methods for worn or otherwise substandard parts with information
necessary to determine when to replace parts;
d. Instructions for testing the article after overhaul. This should include test acceptance
criteria;
e. Instructions for storage that identify special containers and required equipment or
tools. The ICA should also include the environmental restrictions for storage and storage limits;
and
f. A list of tools and equipment necessary for maintenance and directions as to their
method of use.