Source Control Drawings are mainly used for single source items. You should consider making a Vendor Item Control Drawing instead, where you can have multiple sources.
You should list the Supplier information (name, address, part number) of the part you are sourcing, including Quality Requirements, Performance Data, interchangability of the part.
You need "Source Control Drawing" printed on the drawing, .25" tall.
You need 2 general notes:
1- Only the item described on this drawing when procured from the vendor listed hereon is approved by (your company) for use in the application specified heropn. A substitute item shall not be used without prior approval by (your company).
2- Identification of the approved source hereon is not to be construed as a guarantee of present or continued availability as a source of supply for the items described onthe drawing.
Try to get a hold of ASME Y14.24M for further information. Ray Reynolds
Senior Designer
Read: faq731-376
"Probable impossibilities are to be preferred to improbable possibilities."