6lb 1911 recoil spring

Some time ago I seen a 6lb recoil spring for the 1911, not sure where, anyone know where I can get one? Not sure if I would need 6lbs but would be nice to have 1 or 2. Did order 7, 8 and 9lb springs that are on the way. Have quite a few 10lb up to 20lb springs.

Wolff offers 1911 variable recoil springs down to 5lbs
Springs for 1911 GOV'T PISTOL Semi-Auto Pistols (gunsprings.com)

Variable Power Recoil Springs - .45 ACP

   Reduced Power...: 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, & 15 Lb.
   Factory Standard.: 16.5 Lb.
   Extra Power........: 17.5, 18.5, 20, & 22 Lb.

Thanks! I did look at the Wolff site but not at the variable rate springs. I'll give the a call and order a few. Want a few light springs for the .22 conversion I'm making.