Of course if you suspect inferior parts were used, the full monty might be worth it. Sorry can't help with parts source(s).
Intake arm? Gruven works for sure but if you are not a stickler for detail just cobble something together. Heavy coat hanger wire works just fine. Oh, be sure the arm moves freely. It is likely stuck which caused the dogbone to break.
The QuattroWorld website is not affiliated with or endorsed by Audi AG or
Audi of America, Inc. AudiTM, QuattroTM, Avant,
Tiptronic, FrontTrak, A2, A3, A4, A6, A8, S3, S4, S6, S8, TT, TT-S, R8,
RS4, RS 6, Q7, Q5 and allroad quattro are trademarks of Audi AG.