Fix the two things that knock a Strat out of tune: the trem and the tuners. You get a Wilkinson WVS50IIK 2-point tremolo with stainless saddles, a set of R15T-03 6-in-line locking tuners, and a hardened 7mm truss rod wrench for setup. Buying the kit costs about 10% less than buying the three parts separately.
Will it fit?
The WVS50IIK is a 2-point trem with 52.5mm string spacing, so it suits American-style 2-post Strats. The R15T-03 tuners are 6-in-line 2-pin tuners for Strat and Tele style headstocks. The 7mm wrench fits 7mm hex truss rod nuts. Check each part's own listing for full specs before you order.
In the box
Wilkinson WVS50IIK 2-point tremolo (black or chrome)
R15T-03 6-in-line locking tuners (black or chrome)