I have this car and shopped at the local ACE HARDWARE store for replacement foam rollers. They carried that brand, but not the size I needed. Maybe the local Lowe's or Home Depot big box stores would have it. My existing foam rollers are still in good shape, so I'm not desperate -- yet.
IMHO, the best feature of this design is the 45-degree angle of the rollers in relation to the track, so the rollers "scrub" the rails; not merely roll over them.
Mike M. LCCA 12394