disk brake question??

[bowtieguy61]

hello. im brand new here, and let me start by saying that just by browsing the messages, it seems that you all have a lot of experience and knowledge. i have a 63 swb fleetside and a 61 swb stepside. my 63 is in running condition (needs resto), but it is my daily driver. my 61 i just bought last week for parts to restore my 63. after i got it home, i realized about the tortion bars. ive decided to restore the 61 and want to upgrade to coils and disk brakes. now ive read all the posts i can find about swapping the 73-87 front crossmember with a-arms and spindles. correct me if im wrong that a 73-87 front member will bolt up except for drilling a few holes that i understand to be for the tie rod idler? now my question. i already have wheels and tires that are 6 lug, but every 73-87 1/2 ton ive seen are 5 lug. 3/4 tons are 8 lug. i really want to stay 6 lug, so are there any rotors that will work on the 73-87 spindles that are 6 lug?? and do all 73-87 spindles have the same bearing dimensions? thanks for any help with this.