We normally stock Bourns 6674S-1-502 rotary potentiometer.
We are able to special order the optional A/R pin part number, per middle of page 1/3 on the datasheet.
According to our product manager:
We can offer this as a Non-Cat. Please use the same part number 6674S-1-502 but make sure we note with “AR Pin".
To Request a Non-Catalog Reqeust for the A/R part, please use the Special Order Product Request Form (digikey.com).