Re: ECE 6 lug disc brake rotors?
 

ECE sells the 6-lug rotors by themselves.
($89 each part# 03-63-70-6L)
Look here:
http://www.earlyclassic.com/catalog.aspx
As long as you have spindles for 1-1/4" rotors,... they will work fine.

Re: ECE 6 lug disc brake rotors?
 

you can use aftermarket spindels or some off newer truck on my 67 i used 71 spindles and calapers had to use 71 balljoints to, also the tie rods didnt work i used tie rods and stering box off 71 but u can just change outer tie rod to 71-72 and get an adapter i also put power brake master and boster at the same time used proposining valve off 71 oh ya and if you go with power strering option you will probably have to cut about 1/4" off the back of the radiator suport mount to make clearance for stearing box i bougt i 1971 lwb on its way to crusher or $200 took all the parts i needed sold cab for $200 scraped the rest for $75 i only had to buy new tie rods, ball joints, pads, rotors, brake lines, and i could have used old ones if they were in beter shape.

Re: ECE 6 lug disc brake rotors?
 

Sorry to bring back the dead a bit... If a Chevelle / Camaro / Nova rotor will fit then you can put on a set of C3 Vette 11.75"x1.25" rotors & bearing hubs and use the truck D52 calipers on them. You would have to build a new caliper bracket though as the Vette caliper bracket is for a completely different caliper design that really sucks. Heavy, expensive and prone to sucking air.

Another option is to use a newer 6-lug floating rotor off of something like a 2000-up Tahoe on the truck drum brake hub with a fabricated caliper bracket.

Re: ECE 6 lug disc brake rotors?
 

The truck drum brake spindles are of similar design to the first gen F-body & other car spindles with a bolt on steering arm. In the cars GM made bolt on caliper brackets that used one of the steering arm mount bolts and the boss that the wheel cylinders bolt to as the anchor points for the caliper bracket.

The same could be done with the truck drum brake spindles. The down side is that the cost of the fabricated caliper brackets would far exceed the cost of a set of common junkyard square body disc brake spindles with integrated caliper brackets.

Unless you could use a newer less expensive or larger floating rotor on the drum brake bearing hub like the C3 Vette's do it wouldn't be worth the time to fabricate the custom caliper brackets. It is possible a 2000-up Tahoe front or even rear floating rotor may work for this. The fronts are 12" and the rear are 13" but much deeper. Next time I do a brake job on my Tahoe I will yank the rotors and play around a little to see if it can work.

Re: ECE 6 lug disc brake rotors?
 

Newby to the pick ups; I have 2 68`s that I would like to lower 2" front/4" back on both trucks as they are both drivers and 6 lug trucks the (GMC) is leaf rear the other is Coil rear (Chevy),can I do 2" coils in both for fronts and 4" coils on the Chevy rear?, and blocks on the rear of GMC?, also can I add brake booster to drum brakes on them?, thanks you guys are great wealth of knowledge on these trucks !