Polisport does not make their plastic swingarm protectors specifically for the 2019+ Honda CRF450L/RL Dual Sport models, however they do make a set for an older generation 2017-2018 CRF450R/RX that will fit the L/RL models with just a very minor modification (see below). They are available in black, grey or red plastic.
We recently installed these on our CRF450RL Supermoto Conversion. Installation on the CRF450L/RL is pretty easy... for the most part you just slide the protectors over the swingarm, and once positioned in place, you use the included heavy duty zip ties to secure them to the swingarm. They also include two strips of adhesive tape that go on the inside of each protector to stick them to the swingarm. The combination of zip ties and adhesive tape make for a very secure installation. To make these fit the CRF450L/RL, the only modification necessary is on the left side (chain side) protector, you have to notch out two sections of the protector where the bike's swingarm has the welded on tabs that hold the heel guard to the top of the swingarm. The right side protector fits right on with no modifications.
Polisport Swingarm Protectors, Black: Part #8985700001
Polisport Swingarm Protectors, Red: Part #8985700002
Polisport Swingarm Protectors, Grey: Part #8985700003
WHERE TO BUY:
• Polisport Swingarm Protectors at Revzilla
• Polisport Swingarm Protectors at Motosport.com