Looks like the civic and integra inner ball joints are different, integra ones beeing beefier - see below, this guy had a mixture of civic and integra bits when building a mini converted to Honda power
So it looks like I want a new set of inner integra joints so it'll be much stronger. The only problem is I was due to drop the shafts off to be copied in one piece tomorrow but I'm now worried that if the new joint/tripod arrangement is splined differently to the shafts I have then I've basically got some very expensive driveshaft shaped paper weights. So need to get them first and check they fit the ****** drive shafts I have, then get them made. Argh!!!!