Quick question here: does anyone know Thunder’s stocking bushings durometer by color? Couldn’t find any updated chart/guide online.
Thunder stock bushings are all 90a - as in the bushings that come in the trucks.
The seasonal changes in colour don't matter, as they are all 90 duro, eg more recently they have been ice blue, but the more common ones were murky yellow or orange, often depended on the size so others said, but in a dozen different sets of normal 149s over the last few years, I have seen / had quite a few different colours and they were all the same.
The aftermarket ones are different, as per the rebuild kits (with all the washers, nuts, pivot cups, etc), red 90, blue 95 and black 100, as well as the bushing tubes being different again, colour specific to duros as per this pic.