difference between 4 speed hump Buckets/Bench?

Hello, i am looking at 4 speed humps for my 74 dart, and was wondering if there was any difference between bucket & Bench humps? (i want to keep my bench) On all the repo's they look the same and on some of the orgional ones i see a little bracket towards the front? just wanting to make sure i pick up the right one once i find it.


Thanks
Ryan