The best thing is to find an RA65 (Celica) with blue interior. I believe they are compatible in colour. I have an SA63 with the RA65 Front Seat Belts (Black Interior) because they share a sliding Seatbelt Rail at the base of the belt.
You would be lucky to find an MA61 Chassis. So in general look towards the RA65 for interior parts is the next best bet...