The Sunsong hose will be closer to OE than any other aftermarket if not identical, use Subaru # 909170062 clamps. This is Amazon but they are less then $4 ea at the dealer. the first one is 15.8 O.D., Honda has one that is 15.5. What ever you use dont use the worm drive crap unless they are lined.
Buy Subaru Genuine 909170062 Return Hose Clamp, 1 Pack: Clamps & Sleeving - Amazon.com ✓ FREE DELIVERY possible on eligible purchases
www.amazon.com
I also keep these in stock, they are the some of the strongest.
Buy Subaru Genuine 909170063 Hose Clamp, 1 Pack: Clamps & Sleeving - Amazon.com ✓ FREE DELIVERY possible on eligible purchases
www.amazon.com
HondaPartsNow.com offers the great deal for genuine Honda parts, 53729671003. Clamp D (15.5MM) for $2.17. All parts are backed by the Honda's warranty.
www.hondapartsnow.com
HondaPartsNow.com offers the great deal for genuine Honda parts, 91405SS0003. Clamp, Tube (D21) for $5.43. All parts are backed by the Honda's warranty.
www.hondapartsnow.com