I almost forgot to post a link to Wolff Gunsprings. Their web address is easy to remember. It's gunsprings.com.
https://www.gunsprings.com/index.php They make 10% extra power magazine springs for most pistols, and 5% extra power magazine springs for Ruger LCPs, along with recoil springs for 1911s and other pistol ranging from reduced power to extra power.
For Government Model 1911s alone they have
CONVENTIONAL RECOIL SPRINGS - .45 ACP
Reduced Power...: 7, 8, 9, 10, 11, 12, 13, 14, 15 Lb.
Factory Standard.: 16 Lb.
Extra Power........: 17, 18.5, 20, 22, 23, 24, 26, & 28 Lb
and
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.
My first Para-Ordnance, the kit, came with a heavy 18.5 pound recoil spring, and a solid plastic guide rod to help absorb recoil. The aluminum frame would have been battered beyond repair without them, but I switched to a steel guide rod (Dwyer Group Gripper) and Shok-Buff with a heavy recoil spring. Wilson Combat sells the Dwyer Group Gripper now, but I don't see one with a full-length guide rod on there anymore. Not that a Government Model .45 has ever needed one. If you can't find a spring you need from Wolff, chances are, you won't find it anywhere. The only other place I bought gun springs from was IMSI. I bought a pair of Para-Ordnance 170mm Magazine Springs from them for my 20-round .45 ACP mags. 170mm is ~6.7 inches and 140mm is ~5.5 inches. It's easy to find springs to fit 140mm mags, but not as easy to find 170mm, especially if you don't run an STI/SVI 2011 race gun.
https://www.ismi-gunsprings.com/ https://wilsoncombat.com/group-gripper-kit-full-size.html