63/64 13 and 14'' sbp wheel question

Hi folks,
I want to upgrade from 13x4.5 to 14x5.5 sbp wheels for my 63 Valiant. Just bought 4 new matching 14x5.5 wheels. Due to insurance and technical surveillance regulations here in Germany I have to prove that the 14'' wheels were stock equipment or additional dealer available accesories to mount them street legal. My 63 service manual does not list 14'' for the valiant. Do you know in which year the 14'' wheel became valiant stock equipment? Or do you know if 14x5.5 could have been had as an dealer option/accessory in 63 or 64? Best would be a (digital) page copy of an old parts catalogue or a dealer ad. Anyone may help?