help

Can any one help as i am really cheesed off rebuilding 90 after everything thought i would fit a second hand td5 heater can anyone help brought a seal from craddocks but it seems miles to big it's a wedge shape but i cannot see how it will compress to fit up against the bulk head what i thought would be simple is being a right pain have i brought the right seal?

No offence guv but you will probably get more help with a more descriptive title, stating what age of vehicle you have and the part number of the seal you bought.
Good luck