These come in 48" lengths,& no parts butchin needed to mount stock parts.
You get two 48s for $25.+ shippin. I'll cut them to your length & send all 4 pieces.Most of the time the cut offs are good for dolly or short truck.
If you want drilled & taped holes,P/m me.
UPDATE!!
Now for a meer $10 you can have the rear of the rails look like this!
OOOH! Now isn't that sexy?