Hate to break it to you, the only warranty that you have on those lowers is the Harley parts warranty which is ONE-YEAR. Now if you're dealer that you bought the bike from warranties them along with the 2 year bike warranty, that is on them. But all parts installed at the dealer, no matter before or after the sale carries the P&A warranty.
It's 2 year. So I'm told. And my dealer has been more then fair and honest with everything so far. They even had my Speedo cover repainted in them knowing I chipped it. I'm not to worried.