I have a Truvativ Giga XP bottom bracket with the external bearing cups and, based on its track record, am looking for an acceptable substitute for if/when it does crap out on me. I had an old ultegra bb from my road bike that I tried but the spindle seemed too small for the left side bearing. So, are there any other reputable manufacturers and models I can try that will work with my current crankset (Truvativ Stylo).

Thanks for any and all help!