Will F it F ollowing M odels. For Freightliner 2004 and older 12.7 engine. Most common air compressor on Detroit Series 60 12.7 (PRE EGR) 2004 and older models. This listing is for TF-750 Series 60 Detroit Compressor. It is same as TU-FLO-550 just 750 is producing more air more CFM. There will be delay if this process is not completed. Parts that are modified in any way or damaged as result of improper installation will not approved for return. During the high season time, there might be times that popular merchandise are backorder, we do try our best to keep the inventory accurate for the item that we list. There might be chances that the item is out of stock before we can stop the listings.