Wiper Blade Size 47-53

[NeoJuice]

I just got my Newport Engineering 12V factory replacement wiper motor and I need some information about what wiper blade size I need. The new motor will be hooked up once I remove the old vacuum unit in my 1952 Chevy pickup.

I will be hopefully using my OEM wiper arms but I'm not sure what blade size I need. Looking on the LMC website they list 9" and 10" blades in different styles.

Looks like there is a OEM style arm and a Snap-in style wiper arm and a OEM style blade and snap-in style blade.

Should I ditch the OEM wiper arm and change to the snap-in style? I want something that will snug up against the widow good and have easy blade changes if required.

Thank you.