Leo,
Have a look at this web site it may help you
http://www.weasner.com/lxd/techtips/lxd75-pier.html
Their are a number of drawing ,I have copys of the drawing on my work computer but i will not be back at work untill May .If want them give me a ring on 0412998031 I will duck out to work and e-mail them to you.
Ian Danks