These point to Gently Silver Met HN192M paint code for HR215
https://www.lawnmowerforum.com/threads/restoration-hr215-sxa.38003/page-6
https://www.lawnmowerforum.com/threads/hra215sx-paint.54971/
This one points to NHB37M for an HRR216, which I would assume would be closer but actually looks...