Are you talking .155? Sounds like you're gonna have to check out Circle K strings. D'Addario's largest string is .145 and it's only available in long scale an super long scale. Good luck!
Praise & Worship Bassists #90, Squier Precision 5-String Club #1, Ibanez club #184, Bassists Who Drive Manual #1, Acoustic Bass Club #139, GK #688