long socket rails needed

[habitualviolatr]

Help, I am looking for long metal socket rails that except the sliding metal clips
I use to buy longer ones from Snap-On but they are no longer available.
Would like to buy as long as possible up to 48".

Thank you,

 

[mr overdunne]

I think snap on still sells the tray with four on them. buy a few and rivet them down to a piece of steel or wood.