Given the added complexity of removing the keyboard, spend the extra $10 and replace the entire assembly.  Which one you want depends on the color palmrest and keyboard you have (or want). It's just not worth saving $10 for the sake of all the added steps required to remove the keyboard and reassemble it before you put the entire system back together again (the same tear down that's required to replace the palmrest assembly is also required to replace just the keyboard).  
I NEED TO REPLACE MY KEYBOARD. .FROM WHERE I CAN ORDER REPLACEMENT?
DELL INSPIRON 13 7391 2 in 1