Hello! I purchased a 1989 Bridgestone MB-1 Comp today! It is in pretty good shape with a lot of original components. It has some scratches and surfacial rust, but nothing major (battle scars proving it was ridden and enjoyed!). I am hoping to do a complete overhaul and restoration on it, getting it back to original stock as possible. It has an aftermarket fork, stem, and brakes (levers and cantilevers). I have found used stems and brakes online, but can’t track down a Tange Koski fork anywhere! I did happen to find a Ritchey Logic fork, which is stock for the 1990 MB-1, is it worth it to paint and use the Ritchey? Or should I hold out for a Koski? I appreciate your advice! Thanks!
I wish I could upload photos but I don’t have ten posts yet...

Thanks for the advise! The seller also said that he is going to ask his father (the original owner in another state) if he still has the original parts. I said I would be happy to buy them and pay for shipping if he still has them. But considering the mods were made almost 30 years ago, I won’t be holding my breath. If that doesn’t work out, I will probably just get the Ritchey as a placeholder until I can track down a Koski I only have three more posts until I can upload pics!

Thanks for the help everyone! I think I will get the Ritchey forks for now. I got the bike for $50 on Facebook marketplace, the replacement forks are more than the bike! The seller is also going to try to ask his father if he has the original parts. The mods were made almost 30 years ago, so fingers crossed! The seller also knew the value of the bike, but was looking to pass it on to someone who wanted to restore and ride it, which I can’t wait to do!
As you can see in the pictures, the replacement parts as follows: a no-name headset, the brake system was replaced by an Avid system, and the fork was replaced by a Marzocchi Bomber suspension fork.