Ohhh Dear parts needed for baumatic BDI631 (wheels) etc

Hi Gents,
A few years ago a friend of mine needed to replace his built in dishwasher, and I searched for the best buy for him (as I thought then), and found a Baumatic BDI631 as a replacement at a good price through appliances online, free delivery, and a 2 year warranty etc.
Now I’m thinking NOT a good idea, a few years on now, I have just been searching for parts for this appliance and found parts to be very expensive for this make of appliance, and quite a few not available.
What I’m after is the the top basket rollers, can’t find any, only the full basket, and the full set of wheels for the bottom basket, again not available, only the full baskets, listed only on Connects site, as listed below
Dishwasher Basket (2823496CO) bottom at £63.50 +vat
Upper Basket (2935889CO) at £56.93 +vat
Then 4x these Basket Guide Wheel (Rounded Version) (2628199CO) at £2.25 +vat each, Ok for price.
Thats where the Ohhh Dear comes in.
Can anybody give some part numbers for these replacement parts, at reasonable prices.
Thanks
Tell..
Do your Best Gents.
P.s. S/no.66100305507