hi can you help i have a hymer 534 b class based on ducato 2.8idtd 2000 x how do i identify what model it is i.e 10 14 15 maxi and so on the wheelbase is 3200 mm and 3400kg i have contacted the dealers to no avail any help will be greatfull as i need a rear brakedrum if i know the model i can go to the scrapyard and get the right one thanks stubby