I've just replaced the 7 leaf springs in my 1972 4/4 (4 seat) with 4 leafs springs. Check out my thread. Failry straightforward but a few things to be aware of.

"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10