for SU-HIF type carburettors - superior replacement of needle valve and seat
MG MGB with SU-HIF4 carburettors • MGB-V8
other manufacturers Rolls Royce Silver Shadow II plus Bentley T2 from 1977 to 1980 (from VIN...30001 to 41686) • Rolls Royce Silver Spirit plus Bentley Mulsanne from 1980 to 1986 (from VIN...1001 to 16930)
These valves are less likely to stick open or over fuel on run over.