Note: If you're using the compressor included with the #19155066 serpentine drive kit, these adapters might require modifications, spacers or may not work at all, we've received differing reports. There are no issues when using the truck version of this compressor. If you have or want to use the Denso 10S17F or 10S20F AC compressor on your LS engine swap, these adapters are what you need! These convert the compressor to #8 and #10 O-ring fittings. Seals and O-rings included. The Denso 10SxxF compressors are normally found on LS1 style engines that have the truck accessories like the LQ4, LQ9 and most other truck 4.8, 5.3 and 6.0 engines. Note: Even though it has the 10S17F model number on it, the compressor that comes with the #19155066 Serpentine Kit will not work with these adapters without modification. The factory truck compressors do not have this issue.