There are a couple of questions you gotta ask yourself before purchasing these 'door hinge' replacements. And just to note, nothing to take away from George at RDS, he rocks, always has answered a question or two when he has a chance even though I've only purchased 1 product from him.
First, how long do you want to keep your D90 ? If more than a few years then don't go this route... you'll have the same problems as you're having or had due to this 'steel' illness.
Second, If I'm planning on keeping this vehicle (and I like to quote someone on this board but I can't remember who) "...till they pry my dead hands from it..." then why not go for something a little nicer, that won't rust like Motosource.com's set. Actually I may be shooting myself in the foot but I don't know if he's got a set ready for shipment. Last I heard he was waiting on them to come in.
In any case, the original was good, you need something better.
As far as the door panels go check out that site on posted regarding 'Wing Vents' and they have a # of replacement panels. Now, don't get me wrong, if I post a site about a particular product it's only because I have too much time on my hands to research D90 products on the internet and on my favorite LR magazines. I do not recieve any type of re-imbursement or anything like that. I'm just obsessed with this truck and love to see new products.
And speaking of links, I've found some good one's this week and another is: http://www.forgetech4x4.co.uk
that has some really cool ally interior door products like: window winders, door handles and gear knobs.
Anyway, if you're bored and have money burnin' a hole... lol...
Good night, it's getting late.