Yes it's all good, it's the guibo joint you're talking about, both that and the centre bearing are new.
Thought about the 7.5" diff, think it's probably a worthwhile addition, but I think I'll break it again by next week as I'm about to have more boost! The only thing I have never touched in this car in 12 years is the rear diff, last week the box was changed for a 2nd hand standard one which seems nice, it's predecessor was brand new from Ford and only lasted 4k miles, it always drove like crap and seems a pig to get into gear.