How to know what "code" leaf spring will fit my ranger?

[sheliable]

My ranger's drivers side rear leaf spring had the middle plate break somehow (i have no idea, wasn't even driving it crazy).. but now i need to get this thing replaced. I'm looking to source one or two replacements from a salvage yard near me and get this fixed pretty cheap, but when I use car part to find them I'm not sure what this means:

How do I ensure that I find a rear leaf spring (or two as I hear you should probably do both at the same time) that are definitely going to fit my vehicle?

Thanks!

 

[2011Supercab]

What is the 2nd letter on your spring code on your door sticker?

 

[sheliable]

What is the 2nd letter on your spring code on your door sticker?
View attachment 102056

 

[sgtsandman]

Front and rear, I think.