49ers draft outlook: Offensive line
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In addition to being the 49ers' starting right guard and bringing stability to a position that has been a trouble spot, Alex Boone also served last season as the backup tackle on both sides.

In the middle-to-late rounds of next week's draft, the 49ers will look to draft a player capable of serving as the backup at the left and right tackle positions to enable them to keep Boone in one spot.

[RELATED: 2013 NFL Draft central]

Who's here: LT Joe Staley, LG Mike Iupati, C Jonathan Goodwin, RG Alex Boone, RT Anthony Davis, G-C Daniel Kilgore, G-C Joe Looney, T-G Al Netter, T Kenny Wiggins, G Wayne Tribue

Draft needs: All starters from last season return from an offensive line that started the same five players in the same five positions for all 19 regular-season and postseason games. The top backups on the line last year were Kilgore and Looney, both of whom play center and guard. Kilgore and Looney will have a chance to compete this offseason against veteran center Goodwin, who enters the final year of his original three-year contract with the 49ers. The 49ers can be expected to use at least one of their many picks on a player with experience at tackle.

Good fits: Staley began his college career at Central Michigan as a tight end, and a couple of players who followed similar paths could be options for the 49ers in the draft. David Quessenberry (San Jose State) attended the 49ers' local pro day on Wednesday. Quessenberry (6 foot 5, 302 pounds) might be drafted higher than what the 49ers would want to invest in this backup position. Reid Fragel (Ohio State), like Quessenberry, converted from tight end, so he will continue to get stronger and better at the tackle position. Fragel (6-7 1/2, 308) is considered more of a late-round prospect. The 49ers have shown a lot of interest, along with the New England Patriots, in Azusa Pacific lineman Luke Marquardt (6-8, 315). He played basketball, not football, in high school and is very athletic. Marquardt, who underwent foot surgery this week, is expected to be a late-round pick. Oday Aboushi (Virginia) and Ricky Wagner (Wisconsin) are a couple of other tackles who show good versatility to play on either side of the line.