It's inevitable that you will receive aftermarket parts that require modifications to fit. The Mk3 door handles, for example, is not a matter of plug and play - it can be done on a Mk2 with slight modifications, but I'm guessing for a Mk1, it will require some moderate modification.
Having said that, many reputable eBay shops do provide some quality parts, and will provide refunds/exchanges when needs aren't met, but the fact that most of these shops may be overseas makes it incredibly hard and long to get take those parts back for a refund/exchange. I think that eBay is just as good when compared with a local shop/dealer, but the fact that you're dealing with a computer rather than a salesperson/specialist means that you won't get as much communication and as such, convenience becomes the main problem.
For me, communication plays a big part when I want to purchase something, so if I can, I purchase locally. Aftermarket parts to which Australia is relatively low on, I tend to use eBay. Postage tends to flatten the cost differences, so it's definitely more of a convenience issue when purchasing parts.
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