For that tune, a red Stratocaster is practically mandatory. MK "signature series" model optional.
I gotcha covered! I have a red ‘97 MIM Strat (maple fingerboard; IIRC Knopfler’s guitar has a rosewood fingerboard) with Texas Special pickups in it. Played clean, it has almost the same exact tone as Knopfler’s Strat on “Sultans of Swing” if you select the bridge and mid pickups.
I remember reading an interview with Mark Knopfler wherein he mentioned he still had a 3-position switch on his Strat; he thought it sounded better than a 5-position switch (which became available from Fender in 1979). I don’t see how; both switches are identical as far as the electrical parts are concerned.