Italerei has the kit as temporarily unavailable. You could buy a new IP and canopy from Squadron, or get an ICM P-51A, or any other P-51B kit to replace the parts. A reviewer at Cybermodeler said he would have replaced the canopy in the kit, so it must not have been perfect.
WIP: Monogram 1/72 B-26 (Snaptite) as 73rd BS B-26, 40-1408, torpedo bomber attempt on Ryujo
Monogram 1/72 B-26 (Snaptite) as 22nd BG B-26, 7-Mile Drome, New Guinea
Minicraft 1/72 B-24D as LB-30, AL-613, "Tough Boy", 28th Composite Group