According to the service data for the Stage Lead II, (June 1985) two input jack part numbers are listed. There is nothing to identify which locations they are, though. The part list also describes this model as a 'Sidekick Series'.
Fender part # 025210-000 Jack, Input, TJ065-080-01
Fender part # 025212-000 Jack, Input, TJ253-020-02
The Fender part numbers are no longer current, and would need to be crossed to the current version, which may or may not fit your height requirement. Fender C/S might be able to give you the current number. The other numbers are probably those for the original mfr., but it's anybody's guess as to who that was. I found a similar part number series by Google search, but only one hit at BCS Online Catalog - By Brands - M - MARSHALL - Cables and Accessories - Parts and Accessories