Where can I find extra long scale strings that taper at 38.5"?

I have a Strandberg prog 5, strung with extra long D'addario NYXL45130' and I'm looking to go down a gauge to 40-125.

However, I'm struggling to find a long enough scale length that will fit.

I measured from the nut to the end of the bridge saddles and found the following string lengths required:
5th String: 38.5"
4th String: 38"
3rd String: 37.5"
2nd String: 37"
1st String: 36.5"

Unfortunately, D'addario don't do a light gauge extra long scale. DR has the Hi-beams and Lo-Riders but I can't seem to find x-long series on amazon. Are all DR Hi-beams and Lo-riders extra long, i.e. beyond 38"?

Any help?
 
I measured from the nut to the end of the bridge saddles and found the following string lengths required:
5th String: 38.5"
4th String: 38"
3rd String: 37.5"
2nd String: 37"
1st String: 36.5"

Looks like we're talking about 34"-37" multi-scale, correct?

SIT offeres the Power Wound Nickels specifically designed for 34"-37". SIT Nickel Bass Strings Dingwall 5-String 45-128T NR545128DW

Unfortunately, D'addario don't do a light gauge extra long scale. DR has the Hi-beams and Lo-Riders but I can't seem to find x-long series on amazon. Are all DR Hi-beams and Lo-riders extra long, i.e. beyond 38"?

DR "extra long scale" = 40.5" ball to taper. You would probably have to have them special ordered, though. Check with Jason at Fret Nation. [email protected].
 
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