just looking at some auction ads today ive been around crawlers and tracked excavators most of my life, but i noticed a few different units this time 1 is a 450 Deere the other is a komatsu, whats different about these 2 are their track pads, im used to the common pad with 4 bolts, 1 pad sort of overlaps the next ect, on these units which are common looking construction dozers the pads are 2 bolt individual pads with gaps in between them,end on there sort of a triangle profile you can see the track chain a little, not sure from the ads how big the gaps are , but what propose do these pads serve? why are they made like they are?