I may be able to facilitate. Been there, done that.
1989 Dave Scott Centurion Ironman Expert
Appears all original, 52cm, Tange 1, Suntour GPX, Araya CT-370 wheels on Suntour GPX hubs.
Indexed 7-sp Suntour GPX, pretty hidden-spring calipers
Nitto B115-39 bars on Nitto stem, LaPrade seatpost.
Local, not mine, but I spotted it on CL.
Centurion Ironman expert bike
Centurion Ironman expert bike - $225 (Cary)
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20 inch Centurion Ironman Expert Dave Scott bike. Kept indoor. No known issues.
Price slightly negotiable.