I HAVE MANY OTHER PARTS FOR THIS ENGINE NOT LISTED . PLEASE MESSAGE ME WITH YOUR NEEDED PART NUMBERS. 6138-11-4630 KOMATSU AFTER COOLER CORE ONAN 186-0539 NEW OLD STOCK inlet and outlet are approx 3/4" ID and 1-1/4" OD Core dimensions are approx 3" x 4.5" x 25" Please see the pictures that show the dimensions fits SA6D110-1A S/N 10001-UP SATISFACTION GUARANTEED NEW OLD STOCK NOS Please look at my other items in my STORE and add me to your favorites list. NOS means new old stock. These are items that are still in new and unused condition that have been on the shelf or in storage for a number of years. Most of my items are in the original factory boxes or cases. Some of these boxes show a good bit of wear and tear from storage time and handling. I try to add to my store listings all the time. Please keep in touch. I am not an expert concerning much of what I sell ... Powered by Turbo Lister The free listing tool. List your items fast and easy and manage your active items. 11-3-21