Not knowing what these speakers cost it may be more economical to buy replacements
Yes
@g.landboy, note the above.
Sometimes here in the UK, a famous chain will have the likes of Wharfedale Diamonds on sale for under £40. If that sort of option were available in your country, it would (very likely) give you better sound than you had (with working tweeters).
I saw a pair of silk dome tweeters for under £22. As with others, their magnet diameter is greater than yours so some modification of your cabinet would be necessary......but they're arguably better than your speakers need.
Have a look at these laughably cheap piezo tweeters - you can of course ignore the 'professional' label - they will not be high quality. However, they would bring back treble for you and, importantly, probably more readily withstand your volume levels. You can also forget about the series capacitor, as they wouldn't need it:
Find many great new & used options and get the best deals for 2pcs Piezoelectric Tweeter 3" Audio Speaker Treble Ceramic Piezo Loudspeak KY at the best online prices at eBay! Free delivery for many products.
www.ebay.co.uk
Depends whether their size would suit (you'd at least need extra screw and holes in different positions) but, not much to lose by going for them