Iv currently got just a normal seat belt fitted in my avon at the mo but want to fit some harness's. How do I go about fitting them and what do I need to screw the bolts to etc. Any one got any pics of how theirs is fitted or any info on the easiest way to do it. Is it easy???

first question anyone will need to know, are they bolt in or clip in ones?

you will already have 2 mounting point which you can deffinitely use in the bottom chasis rails where the belt and anchor point are situated. You may need to have two more points welded to the top rait to the rear of the seats if they are not already there

the seatbelt it attatched to the side of the roll bar... does that mean welding a plate at the back to attach the harness to?