Difference between parts MM-IT270R and SL481437C1

[presence]

Both of the outer wipers/felt on my scouts windows are bad, but I figured it is probably just as well to replace both sides on both windows. I have a 74 Scout II, and I found two products that seem to fit, one is a 4 piece set, one is a 2 piece set, and just wanted to know if there was any other difference I need to worry about, the second link for the smaller count item is 2x the weight of the first link...

door window wiper & felt kit1971-80 Scout II, terra or traveler - IH Parts America
Vs
window door felt for Scout II, terra, traveler - IH Parts America

 

[FDChappie]

The kit does both doors.

 

[presence]

the kit does both doors.

So the same kit with higher count.

 

[Scooter]

The one kit with only two pieces will do one door. The kit with four pieces will do both doors. Each kit will replace the felt strip on both sides(inside & outside) of the window