a pair of poor chrome stauntions bent to suit, with pivot bushes inserted and bronzed into the ends, (use the nickle silver rod with gas flux and DH2000 torch) same as my race bikes. swing arm modified to suit from salvage. This is likely a repeat but worth mentioning again. The aim is to end up with about the same negative trail as the average car, 1/2" this is how you avoid fighting to keep it going straight. A solo has around 3" positive trail, put a chair on it and it is trying to castor back around like a shopping cart. If in doubt "too strong never broke".