Try CJPony Parts Inc. their toll free number is 1-800-888-6473, web sites:
www.cjponyparts.com and
www.emustang.com, they have T-5 conversion parts and access to a boneyard, so they might be able to help you out. When I did a T-5 swap into my '68 I used the pedal assembly from a '67 or '68 (can't remember which) Cougar. I just bought a hydraulic clutch conversion kit to replace the old mechanical linkage, I can't wait to install it. Good luck.
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1968 Fuel Injected Mustang Coupe