Don't just rebuild your calipers, upgrade them.
Caliper restoration set for Rear of Maserati Bora 1972-1979 includes:
2 316 stainless steel 48mm caliper pistons, made in Canada
4 316 stainless steel 34mm caliper pistons, made in Canada
1 Seal kit, made in the UK
Reference numbers: SP2526, 191206, 191209, 64325873, 64325404