This Dorman Brake Wheel Cylinder is a perfect fit for your Isuzu NPR or GMC W4500. It is designed with high quality components and a rust preventative finish to ensure long service life. The mounting style is bolted and it is made in China. This item is a NOS (not old stock) and is perfect for those who are looking for a replacement part. It is not a vintage part and is not intended for universal fitment. The OE/OEM part numbers are 97078039, 8-97078-039-1, 8-97078-039-0, 8-97139-851-0, and 97139851. The manufacturer part number is W610066. This item is ideal for those who are looking for a reliable replacement part for their vehicle. Exact item is shown. New without original packaging. No returns if installed. Made in China. Please review our business policies in our store for information regarding returns, shipping and warranties.