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Post-combine update: 49ers at No. 17

Mel Kiper had offensive tackle Trent Williams heading to San Francisco as the 17th overall choice in his pre-combine Insider mock draft.

I'm revisiting the pre-combine item making sense of first-round choices for NFC West teams, adding post-combine thoughts, continuing with the 49ers:

17. San Francisco 49ers

Mel's pick: Trent Williams, OT, Oklahoma

My pre-combine thoughts: The 49ers would win the draft-day report cards if they emerged with Spiller and Williams, filling two obvious need areas. This might be a little earlier than the 49ers would like to find their next right tackle. They drafted left tackle Joe Staley at No. 28 in 2007. But based on how Staley has performed, the 49ers could have justified drafting him earlier. If Williams is the real deal as a right tackle, he would give the 49ers bookend tackles for years to come.

My post-combine follow-up: It's potentially a surprise if Williams lasts this long. The offensive tackles were mostly impressive at the combine. But if Williams is around, the 49ers could do worse. They would address an obvious need with a player at a low-risk position. Even some of the disappointing first-round offensive tackles wind up starting for long periods. For example, the Raiders whiffed on Robert Gallery when they drafted him second overall in 2004, but Gallery has still started 79 games. It's important for the 49ers to emerge from this draft feeling as though their offensive line is pretty much set, particularly at both tackle spots. This selection would look good on the post-draft report card, with a good chance of holding up over time.