What socket size can be used if no 3/8 wrench?

21 mm will fit, the 3/8 is the drive of the ratchet that fits in the center of the filter wrench

Will fit 2008 bmw x5 ?

Dont know..... it fits 2013 x3 and 2012 535i

Does it come with the plastic seals?

Not sure what you mean here. There are no plastic seals, this is tool to remove the oil filter housing for BMW. I purchased this ibetter tool and it does "NOT" work well at all. I would recommend the following from Motivx / Amazon: https://www.amazon.com/Motivx-Tools-Filter-Cartridge-Housing/dp/B01N54IT33/ref=sr_1_2?dchild=1&keywords=Motivx+bmw&qid=1621773956&sr=8-2 Make sure you put your vehicle information at the top left to make sure it fits. Hope this helps.

Manufacturer	Ibetter
Part number	Ibetter864
Item Weight	190 g
Product Dimensions	9.5 x 9.5 x 5.6 cm; 190 g
Item model number	[GENERATED] IB-WF-86.4-16-BMW-VOLVO
Size	86.4mm
Color	Set1(Wrench)
Finish	Polished
Material	Alloy Steel
Torque	1.5E+2 Newton Meters
Item Package Quantity	1
Head Style	Fixed Square
Batteries Included?	No
Batteries Required?	No

Ibetter 86.4mm 16 Flutes Oil Filter Wrench for BMW with 86mm Cartridge Style Filter Housing Caps, Oil Filter Housing Cap Removal Tool to Change Oil, Oil Filter Socket Wrench Kit for BMW (Black)

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