Chainrings for Shimano FC-M760 crank worn out, need help
It's a very populous crank and generally speaking any aftermarket/replacement type chainrings will go on it. It tends to be true that the designated Shimano chainrings make the best replacements for their cranks in terms of performance, or at least avoid minor weirdness with spacing or spider fit, but it's rare for those issues to be insurmountable when fitting aftermarket replacement rings on to a mainstream crank like this.
There are some 104 rings where the rounded contour of the spider can be a mismatch. If memory serves you get into this from mounting Truvativ/SRAM rings on Shimano cranks, but I may have that in reverse. You knock the ring down slightly with a half round file and it's fine.
Some brands to look out for aftermarket replacements are Origin8, Dimension, Blackspire, Vuelta, and TA. The 2020 parts shortages have not hit generic replacement chainrings that hard and I see some of these are still readily available from distributors.