My FU4 came with 45-105, so if Modulus used a similar gauge on six stringers, these may work - Invalid Link Removed set.
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Thanks for the info Kinetic and gwangi - I initially posted the wrong link from my phone, as I need a 5 string set for this bass (not 6). That said, it looks like the closest approximation would be...
These:
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Or These:
[Invalid or Expired Link Removed]
My Modulus manual specifies the following:
String Gauges for Quantum Bass 4, 5 and 6
Quantum Bass 4:45-65-80-100
Quantum Bass 5: 45-65-80-100-130
Quantum Bass 6: 32-45-65-80-100-130
Nickel Roundwound, Extra Long Scale
This makes me think that it's the D'Addario set (the gauges all match), but the manual itself looks pretty outdated, so they certainly may have made the switch to Dunlop gwangi suggested above. What to do...
Thanks for weighing in Edwin - ultimately I will indeed do what I want to do... there are no rulesI posted the initial question to see if the factory set was available somewhere, as I have enjoyed the way they sounded on my new Q5. Then again, maybe it's just that it's a killer bass and another type of strings would suit my playing even better. I've also been considering going in the opposite direction and trying the whole Mike/Phil approach with some Ken Smith Slick Rounds (though I play almost exclusively fingerstyle, so I don't know how that'd work out). We'll see...
You also brought up a good point about the .130 B string. I tend to like the sound it produces, but I'd definitely agree that it feels like it doesn't quite fit... too rigid. What's your go-to set on your Q6?
Thanks for your input sleepy - just to clarify, how long ago did Joe tell you that? Just wondering if it was before or after they switched to Dunlop... at this point, it seems like both D'Addario and Dunlop would both provide a set fairly similar to what Modulus ships with. I'm also interested in Edwin's DRs, as it makes sense to have a B that matches up a bit better. All other recommendations are most welcome!
These are what I use: [Invalid or Expired Link Removed]
I concur with previous opinions - the 130 B string just doesn't fit in well with the rest of the strings feel wise or tone wise. I would certainly even go to a 120 B if they made the DR Nickel lowriders with it.
Call them up. It might be possible or already available.

Good tip, thanks!
I've also been interested in swapping out my tuners for the Gotoh lightweights. Did you confirm that they'll fit without drilling new holes?
I've also been interested in swapping out my tuners for the Gotoh lightweights. Did you confirm that they'll fit without drilling new holes?
According to Kinetic Shadow, they are direct replacements. They look identical except for the Modulus logo is not on the back.
That is an affirmative on the direct replacement.
The shaft is actually more of a straight post and does not have the contour to "guide" the string wrap. Reminds me more of a Hipshot post. But again, you'd be hard pressed to tell the difference if you didn't know or weren't looking for it.