even the stern kit doesn't have the capacitor on the listing. i'd call and ask. we've had customers blow up the cabinet node board by installing a shaker and skipping the inline capacitor part of the kit.
from pinballlife:
Factory authorized Stern shaker motor kit.
Designed to work with Stern SPIKE and SPIKE 2 operating systems.
Kit Includes: shaker motor with mounting bracket, wiring harness, plastic cover, mounting hardware, cable ties, & installation instructions.
the screws they send with the shaker motor kit might also not fit the t-nuts on the bottom of the cabinet. stern used a thicker bottom plywood, i think with jurassic park, and could be a title or 2 before that game when they swapped suppliers.