Does anyone know how to install wheels on a keyboard gig bag that doesn't have any (i.e.Casio SC800)?

Since I’ve recently bought a Roland RD88, I’m considering buying its Roland SC-G88 gig bag which has wheels but is somewhat too big for the RD88 because the latter is narrow.

The Casio SC800 gig bag doesn’t have any wheels but its depth is perfect for the RD88.

Does anyone know how to install wheels on a gig bag. I think it may require an L-plate but that’s all I know. If someone knows what materials are needed and how to do it, please let me know. Thank you so much.

Jimmy Figueras.