The rear spring mounts on my 2001 4WD Tacoma measure ~53 1/8" from front bolt mount to shackle hanger, c-to-c.

If you are just looking for a couple inch lift, I note several folks carry lift springs for pre and post 98 Tacomas, wheelersoffroad.com is one. However, they cost like real lift springs do.

On the kids 95 Tacoma, we replaced the real stiff add-a-leaf he had with one of the rear leaves from a 1990 4WD pickup, added about 1.5" of lift to match the Tundra spring lift up front and the ride and flex seem improved over the add-a-leaf.

Greg