CMPNC18K, NS150C, DWEHF1838K, SX1838K, DWFP1838, DCN682M1, DCN682B, DCN681B, EHF1838K, DCN681D1. Part No: 180526. Genuine, OEM Bostitch Rod-Spring Guide, part# 180526. Genuine, OEM Bostitch parts. Porter Cable.
eBay