It's possible that there is some misalignment of the door & cab. Perhaps hinges and/or maybe a cab corner mounting. Was it leaking prior to the seal replacement, and did the new weather strip go on exactly where the old one was? Another thought - it may have a leak between the flange of the seal and the body if there are any gaps or voids between the 2 surfaces. BTW, which "1/2" is new? Or, it may be that the new one is OK, and the seal round the door opening is the leaky culprit.Well going off your picture it looks like it's about as far back as the factory one on my truck is I just went outside to confirm it. One thing I do wonder is does your door sag any because that could let water in.