Hi to all im a newbie to this sight and i need help ,ive got a ford focus 1.8 its a 99 model or v reg ive been given a set of 17" alloys and the offset is 40 ,ive been doing some reading and according to max power/haynes manual the offset of the original alloys are 52 ,but on most alloy sites they say et is 40 so im most confused ,could someone please let me know wich it is et 40 or et 52 ,and if it is 40 what size spacer id need if any thanking all in advane