peuget 106 perished sunroof drain pipes?

i would like to replace my sunroof drain pipes as last year i realised my s plate pug`s had perished,is it difficult,ive already cleared the pipes and that when i realised they were perishing,not suprised really,poor ole car,but im putting her right bit by bit.any advice would be great,i have the haynes manual but cannot find info on drain pipes,ive ordered new ones at a cost of £30 the pair.