4" to 4.5" bolt adapter

I've had a set on my car for the last 20+ years and running with slicks and I havent had any problem (and I have good power too...LOL)But they were made a long time ago when stuff was made well. The ones I see today... wouldn't let an ex-wife go to the mailbox on them ...lol truth be I AM going to convert to 4.5 in the next few weeks just because I feel I been pushing my luck!!!
Ps. there is an ulternative to expensive axles and I will let ya know after I try it myself ...LOL