used Mazda spare parts
https://wiki-fusion.win/index.php/Sourcing_Mazda_RX-3_Parts_for_a_Classic_Rotary_Build
I found a set of used Mazda spare parts from a 2012 model in my uncle's garage after he traded in his car. The pistons and gaskets still looked alright, but the timing belt was cracked. Might work for someone restoring a similar model on a budget.