After the favourable report was received by him in September, the minister of defence in November ordered the Ordnance Department to conclude a final contract with DAF, reaching an agreement on the desired changes. The negotiations soon ran into some unexpected problems. No improved differential type was available and the assumed Ford 125 hp Lincoln-Zephir V8 engine did not even exist, the commission having misidentified the Ford 112 hp V12 engine. Also no choice could be made for a specific armour manufacturer. In January 1939 the minister urged the Ordnance Department to make greater haste, at the same time determining the number for the first batch at twelve vehicles. Subsequently it was decided to fit the new Ford 95 hp V8 Mercury engine and to order armour plates from the Belgian steel manufacturer Ougrée Marihaye.