Rim Sizes TVR Tuscan Mk1

[JimmyZZ]

Hello folks
Since I need new rims I want to double-check before

are these the correct measurements?

rear 8.5x18 5x114.3 et33 71.6 centre bore
front 8.5x18 5x114.3 et42 71.6 centre bore

Or should I go for a 9.5x18 on the rear?
What would be the right offset then?

Best regards in advance!