@Walter > to add related makes, you can simply edit the description of makes and put some text with links, using the same syntax as comments.
e.g.:
https://www.imcdb.org/vehicles.php?make=Suzuki
https://www.imcdb.org/vehicles.php?make=Land-Rover
https://www.imcdb.org/vehicles.php?make=Rover

Thanks for the bugs reports, I'll check and fix these (possibly only tomorrow).
@Sandie > you mean the search for a make or the search on a model?