some disco questions

i was wondering if y’all could help me out here..i was wondering what transfer ports fit in a disco? can a crosman challenger 2009 transfer port fit? what about a crosman 1700P pistol transfer port? i know that both of these transfer ports I.D. are alot smaller than the disco’s, but im going to bore it out to a specific size, and it’d be cheaper to do than making a comletely new one…unless someone could do it on the cheap!! another question is, has anyone tested the theory of a theoben Mk2 series 4 trigger will replace the MRod’s factory blade? ive read/heard that its basically the same trigger unit, w/slight changes. any help would be greatly appreciated!!