The originals are typically Fender Supper Bullets 9's.

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"You can't spend what you ain't got, you can't lose what you ain't never had" ~ McKinley Morganfield

You can do better than Fender Bullets. Try a set of D'Addario or Ernie Ball Super Slinkies - you wont go wrong with those. And I agree, the gauge is almost certainly 9 to 42..

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Fender Highway & Classic 60s Strats, Fender Toronado, Telecaster, Gretsch Projet, Charvel 3, PRS SE Soapbar II & Custom 24, Burns Batwing and many others!

The stock strings are Fender 9-42s but I'd suggest the D'Addarios over the others as they are much more flexible ,hence easier to bend.The D'Addarios also keep their new bright tone longer than the rest,at least that's what I've found.

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'65 Strat,65 Mustang,65 Jaguar,4 more Strats,3 vintage Vox guitars,5 Vox amps,'69 Bassman with a '68 2-15 Bassman cab,36 guitars total-15asst'd amps total,2 vintage '60s Hammond organs & a myriad of effects-with a few rare vintage ones.

Ernie Ball makes an Extra Super Slinky set of 8-38s in a blue pack and the Super Slinkys 9-42 in the pink pack however I find the 8-38 Ernie Balls harder to bend than the 9-42 D'Addarios.

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'65 Strat,65 Mustang,65 Jaguar,4 more Strats,3 vintage Vox guitars,5 Vox amps,'69 Bassman with a '68 2-15 Bassman cab,36 guitars total-15asst'd amps total,2 vintage '60s Hammond organs & a myriad of effects-with a few rare vintage ones.

I use the GHS Gilmour "Blue Pak" 10's.
Easier for me to bend the thicker strings. Don't know why but it works for me!

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"You can't spend what you ain't got, you can't lose what you ain't never had" ~ McKinley Morganfield