Hey Nes
I'm 99.99% sure you can't bolt a red motor pump to a grey
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You could get out the yellow pages and have a look for somone who sells reco ones. Try Thompsons , Harrisons @ Logan , Old Holden Wreckers 742 Logan RD @Greenslopes? PH 3397 9211. Street Neat (Andrew) is selling most of his gear 0412 032 239 @ Thornlands. or Rare Spares. Maybe try a few shops that reco this sort of thing.
Ring around and get the best price , a few calls can save hundreds of dollars sometimes. I once got a price an a pump for $680.00 and ended up replacing it for $45.00 ,with a better pump than the original ,cast iron vs alloy
.
Or place a post in parts wanted , postage on a pump won't be that much even from WA.
I only have one good spare and won't part with it, but who knows what other forum users have sitting in there sheds.
Slim seems to be selling a lot of gear , maybe give him a PM. Good luck.
Brad