Help with fender flares, running board, and front & rear spoilers

[spikeit]

Hello,

I am confused (sorry I am a newbie) but I am looking to purchase the following fender flares for my car:

51 71 7 049 867 -- FLARED WHEEL ARCH, FRONT LEFT ------- 1
51 71 7 049 868 -- FLARED WHEEL ARCH, FRONT RIGHT ------ 1
51 71 7 049 869 -- FLARED WHEEL ARCH, REAR LEFT -------- 1
51 71 7 049 870 -- FLARED WHEEL ARCH, REAR RIGHT ------- 1
51 12 7 046 919 -- REAR SUPPORT BUMPER TRIM, LEFT ------ 1
51 12 7 046 920 -- REAR SUPPORT BUMPER TRIM, RIGHT ----- 1

and was wondering:

1. If they are compatible with the brushed OEM running boards
2. Will they work with the 4.6is front and rear spoilers?

I tried the search function and couldn't find the answers.. not sure if there is any difference between the 4.6is and 4.8is fender flares and if they sold these flares w/o compatibility with the brushed OEM running boards.

Thanks,
R