G'day Jared,
The RH pedal operates the wheel drive clutches [and hence forward/reverse selection], via a linkage. The linkage rod looks to still be in position, from your pic.
Not hard to fabricate one of these, if you have a few sheetmetal and welding skills, or know someone who has.
It's part number 27 of Illustration 2 in the IPL for your machine, which is a free download for ODK subscribers from
HEREThe file is named 'tractor5vevr8vevr10vevr11vevr.pdf'
ODK member 'prd' has several of the Tractor models, and could probably measure up the critical dimensions of this part; I'd drop him a PM to ask.