I would suggest generic/aftermarket. The key things is that the inertia reel bit is fitted in the correct angle/plane (should be the same as the old one) and that the stalk bit is the correct length.

Personally I'd go for something branded like securon or britax, or US equivalent.

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