Yeah, IIRC they reused the steel segments holding the fuel, not sure about the rest (parachutes, nozzle, thrust vectoring hardware & the APU powering that, etc)

Yeah, IIRC they reused the steel segments holding the fuel, not sure about the rest (parachutes, nozzle, thrust vectoring hardware & the APU powering that, etc). And indeed, if you go the SRB way, a modern carbon fibre single use booster would likely be much more efficient (fuel ammount vs weight of construction to hold it) and cheaper. But still not cheaper than a reusable rocket of course. :)