The two main decal guys that I use are Steve at H Lloyds’s for road bike & Gil at Retrodecals for MTB.
Both will make from scratch but need very good photos & measurements. Lloyds are cheaper when it comes to custom road requests as it’s more worth his while but saying that Gil does have part of a very similar font from when I made up a set of artwork for my 1998 CLAUD BUTLER CAPE WRATH so he would only need to create an “O” an “I” & a “S”. And he should also have an appropriate mid 90’s Claud head badge and the obligatory “Handmade in England” and of course he can supply either Shimano or Campagnolo stickers for whichever group you’re using.
For all of the above he can size up specifically to your requirements. It won’t be 100% exactly as per the original but it will be pretty bloody close and in keeping.
(Ps & there won’t be many apart from us Claud nuts who would spot the difference’s anyway!)
Email for Gil;
[email protected]