I don't like that link with those boot specs for the outer end.
The toe links specs have a small seat size of 16mm and large seat at 31 mm and need a boot height of about 17-22mm
Having a little stretch is ok and I think better then anything near a loose fit.
The ones I got from Rich are so tight that they don't need rings and cant go any place.
I think this is about right..
Im going to get some new inside link boots as ones toast so the other will be as well.
Their actual measurements of the inside joint are 20mm x 35mm x 22mm long, so the below boot is pretty tight.
Its seated width is a little big (4.5mm) for the 3mm but should still tuck in.
Ive emailed them for a buy of 4 inner boots and 4 more outer boots.