The Park Lane is on the full sized chassis so the Mustang/Fairlane stuff won't fit properly.
The Kelsey Hayes disc brakes do work great, but they are now rare, expensive, and usually rebuilt in some manner by now.
If they have not been rebuilt properly they are a headache waiting to happen, especially in the piston sticking department (there are four pistons in each Kelsey Hayes disc brake caliper for these years)
The 1965 full sized chassis was the first year for that perimeter frame design, and much of it became the standard for many things for many years to come.
If memory serves me correctly you can take the front end items from any 1969-1972 full sized Ford/Mercury and bolt them right into the 1965-1968 chassis to end with a disc brake conversion.
Take it all from the donor car... basically if it bolts to the spindle in some manner take it, including the spindles, and then bolt it into your 1965.
These come with a large, single piston caliper that works great and gives zero trouble as compared to the four piston, external transfer hose, Kelsey Hayes calipers from 1966-1968.
They also allow for more standard wheel usage because the Kelsey Hayes calipers require a special deeper wheel offset for steel wheels, and spacers for pretty much all aftermarket wheels.
This odd spacing need is a direct result of the design of the Kelsey Hayes caliper.
I know it stinks that you might be starting from scratch again, but depending on where you live you might still be able to find a 1969-1972 full sized vehicle to scavenge parts from for relatively little money.
Some scrap yards will literally torch cut the upper and lower control arms to get at the pieces you need, and it works if you don't want the control arms...just ask them to cut closer to the frame instead of closer to the spindle.
