tssss....rtfm ;p ;-) "What does this item fit in?" : Sea-Doo GTX 4 TEC! -- *Oil spray nozzle (small block with pipe, the parts list calls it "Oil hole adapter" (part.no. 420 956 775)-- *Oil reservoir plug screws with o-ring (8x per engine...Link 1 part.no.420 641 170) -- *Black round cover: see below (I stand by my words;-) -- *"Ring half" (Really!) fits the cranckshaft (part.no. 420 933 475) --. Noteworthy : Rotax Engines (at least the aircraft ones) are famous for keeping parts interchangeable, hence the '2003'partslist. Any year will do usually. Very liable and great to service. Lots of (EU) Ultralight aircraft roam the skies powered by Rotax. (I once did, untill the kids got expensive.) The three screws were left overs from the terrible accident this Sea-doo went through. (Link 2) -=concluding: "It" fits a Sea-Doo GTX 4 TEC. =- (You ruin my rating ;-)

Presumed: Engine parts for a SEA-DOO GTX jet ski, with Rotax engine. The cover (part 420 660 110) has the marking "PA 6.6 30 GF" which is the material code for Glass Fiber Reinforced Polyamide 6.

References:

http://seadoomanuals.net/download/pdf/parts/manuals/2003/2003-seadoo-gtx-4-te...

Reason:
You're definitely on the right track but I need a little more information. i.e. which part of the engine do the parts fit, etc.? That being said, you're killing it. Amazing answers and references. If everyone responded like you we'd clear out that section of the warehouse in no time.

tssss....rtfm ;p ;-) "What does this item fit in?" : Sea-Doo GTX 4 TEC! -- *Oil spray nozzle (small block with pipe, the parts list calls it "Oil hole adapter" (part.no. 420 956 775)-- *Oil reservoir plug screws with o-ring (8x per engine...Link 1 part.no.420 641 170) -- *Black round cover: see below (I stand by my words;-) -- *"Ring half" (Really!) fits the cranckshaft (part.no. 420 933 475) --. Noteworthy : Rotax Engines (at least the aircraft ones) are famous for keeping parts interchangeable, hence the '2003'partslist. Any year will do usually. Very liable and great to service. Lots of (EU) Ultralight aircraft roam the skies powered by Rotax. (I once did, untill the kids got expensive.) The three screws were left overs from the terrible accident this Sea-doo went through. (Link 2) -=concluding: "It" fits a Sea-Doo GTX 4 TEC. =- (You ruin my rating ;-)

References:

http://www.ebay.com/itm/SEADOO-4-TEC-BLOCK-CRANKCASE-PLUG-SCREW-SOLD-INDIVIDU...

http://www.thehulltruth.com/boating-forum/443786-wrecked-while-trailering.htm...

f*k! "Ring half (small) ! part.no. 420 933 470. Forgot the llittle bastards....

References:

https://www.identifyanything.net/listings/1188-rotax

Reason:
Another opinion was accepted instead.