I haven't ran my durga with my new aerated dampers but as for the manual no spacers are needed, as i understand it the 501x dampers are the issues as people have mentioned that the rear piston pins are longer. although i'm using associated springs it does sit quite high. I have silvers all round with the stock setup holes with 40w front and 30w rear, it drops nicely and has good droop on the front the rear appears stiffer. I think one set lower on the rear springs will help but i really need to run it and see. I also need some suitable tyers i'm on worn stocks (tamiya K type) now. Can i get a set of glued and foamed shu yellows spikes with wheels that fit the DB01? if not what good tyers fit my DB01 wheels (preferably black wheels :-P)

Im also using the hopup UJ's on the front but they appear to fit just fine.

It's a good point, the option shocks might not be the same as the 501 supplied shocks.

Re tyres and wheels - open a separate thread?

Have measured them against the kit driveshafts and they seem to be the same length