Ah you cant beat a bit of mastic, many thanks for your help, when Ive done it, I might post some before and after piccys.

all might become clear when they arrive . lol. final question, I realise you use blind rivets to put the frames in, but what size rivets do you use, and can you use a normal rivet gun as ive seen on Ebay that they sell blind rivet guns which makes me think you cant use a normal one. Thanks...

Thanks for the reply guys and apologies in saying thanks, i was expecting an email to say someone had replied to my post, but just logged in to see all your replies. Ive not chosen the windows yet, they will be sliding ones, but I like to get all my facts together before making a decision...

Hi Folks, Im sure theres someone out there that has done this before, but Im thinking of fitting sliding side windows to my 90 td5 van, now I know from research on here, that you measure once, twice, three times and cut once. but what dimensions do you cut the hole to? if you measure a window...