If you’re not too concerned with being able to select the “wrong” years for a model you could just create a taxonomy field to go along with the model post object field in the repeater. Then as you loop through the info on the frontend you’d just output the model post object field and the years selected with that.
Another way would be to also connect the years taxonomy to the parts CPT and just select the years as a regular taxonomy meta box (not sure if that works with your setup.. not that good at autoparts).
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