Factory line sizes are:
3/8″ FEED
5/16″ RETURN
3/8″ Steel Line to -6AN Adaptor
Earl’s 165006 Aluminum -6AN Male to 3/8″ Tubing Adapter
https://www.amazon.com/gp/product/B0002M8VV6/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
5/16″ Steel Line to -6AN Adaptor
Earl’s 165056 Aluminum 3-Piece Tubing Adapter
https://www.amazon.com/gp/product/B000CN5GUY/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
