Well the first question is, do you have the equalizers? Do they work? If not what you have is useless. Next question is can you re-foam them yourself, or will you have to send them out? The next issue is, that I doubt there are new dust caps for those speakers. If not, then the speakers would have to be re-foamed without centering the VC gap with shims. If you try and re-foam without shims, then the chance of having gap rub is significant. If you glue it all up and find you have gap run, you are up the creek without the proverbial paddle!
Vintage gear is worth money, either because it is an interesting curio and or foot note to our history, or the product was an iconic trend setter, that brought about truly revolutionary changes, setting new benchmarks. Those speakers are NOT in any of those categories.
In the UK, where I grew up, we used to laugh at almost all American speakers. They were in the main really dreadful compared to KEF, Lowther and many others. The Quad ESL of 1957 was such an iconic product, as it set a totally new benchmark in accurate reproduction, but not the most powerful. However its development was highly significant. So a working pair of those in good cosmetic condition, justifiably is sought after by serious collectors, and they fetch high prices. Those speakers were of a time where iconic speakers such as AR and Advent were starting to break through. Your speakers did not. Those are the four way speakers we are talking about here. At that date crossover technology was not up to a four way design for sure.
I am a collector of vintage audio to a degree. A lot of it I'm the original owner of. However I can't resist the odd significant curio. For instance I restored a stand alone Dolby B decoder/encoder. I have had a working dbx II decoder, that does tape and LPs. I'm the original owner of that. But I have managed to scrounge a collection of dbx II encoded LPs. I have four vintage turntables, all in use. Most of the vintage gear I have connected, functional and ready foe use. Which brings me to the last point, it is most interesting if the function is at least comparable the standards prevailing today, even if it comes up short on convenience. Good for its day does not cut it it for me. It has to be very good or unusually interesting, period.
Those Mac speakers come up short on all of the above criteria.