Here's the guy they need!

Forrest Merrill
6-1 338#.

[www.pro-football-reference.com]
[www.nfl.com].

Not a pass rusher but an absolute plug on the nose. (Though he did get 8.5 sacks in 3 years at Arkansas State)
Was on/off the Chargers roster so he knows the defense.

Here's a video of him doing 48 reps at 225 lbs then lifting a mini-van