Re: What Mercruiser outdrive is compatible with the Volvo Penta AQ205A GM V-6 4.3L en
A DP-A is not a 290, but some things are the same, the 290DP style is the previous model of the DP-A.
I have been able to find tuneup parts and impeller kits, etc. on eBay. Several good Marine suppliers there. Shipping is not too bad when combining parts.
Also some salvage and used parts there at times.
Best to keep to the Marine distributor and parts, auto parts are not as likely to meet Marine/Coast Guard specs regarding venting, spark potential, corrosion resistance, etc. Same goes for starters, alternators. Have the original OEM Marine ones rebuilt when they need it.
The OEM VP parts are good quality, so you do get more value with the price as well as knowing they are within the tighter Marine spces.