I don't understand all the fuss...it's dead simple, pick up the phone, give them your list of bits you need, and wait for the reply. Pay for what they have in stock, ask when the remaining items will arrive, and either order them or go elsewhere. Not just Westbourne, but any shop...no problem.
I wanted some parts for my Robbe F-16 tx...called Westbourne, got through after a couple of tries, told them what I wanted, they had all the parts in stock I needed apart from the tx tray...on back order, will be about three weeks. I paid for what I wanted and they promised to email me when the tray became available....couple of weeks or so later I received an email from W/Bourne telling me the tray was in stock if I still wanted it...I did, so I paid for it online and it turned up a couple of days later.
Perhaps I'm lucky, but they've always been ok with me.
Rich