Both of my 99's are "hard-wired" to the motor, can't easily change the pedal out. (They're technically both 99K's, maybe that's a difference?) Actually every 99 I've come across personally has been hard-wired. (Just did a tune-up on my MIL's 99K this past weekend; hers is hard-wired too.)
But as miriam said, you can buy a whole new motor/pedal/lamp assembly pretty cheap and they attach VERY easily. One of my 99's came to me for free, mostly because it had really bad wiring and was missing the lamp (it had been simply snipped off, with cut raw wires left sticking out!) - I bought a vintage/used motor/pedal/lamp assembly on eBay for $20 and bolted it on in about 5 minutes. Works great and you'd never know it wasn't the original parts, and absolutely zero knowledge of electrical wiring needed for the job.
You can also order brand new pedal/motor/lamp assemblies online and have them put together for you before shipping, if you prefer new. Probably would cost more than buying used/vintage but certainly an option.