Hi all just sat pondering. I have a 71 dorma and a few years ago i put on the rear 3” horse shoe plates so I could keep everything else standard as I have a really bad memory and it’s less for me to forget . However it’s a nightmare to get the rear wheels off so I thought about putting adjustable spring plates on so......... what do I need to Buy to convert to spring plates and keep it lowered by 3” and would you buy new or get used ones any info would be brill many thanks