My hot water is leaking. On the side of the cartridge, written as "A (or triangle) 98 04 R 90". Can't find product number. Where to measure for 3/4"

I removed the cartridge and measured it. It clearly was not 1/2", but did measure at 3/4". The reason for the leak is the rubber gasket/washer at the end that is worn.

What are the dimensions of cartridge?

The cartridge is designed to fit in a 3/4 inch piped volume control or a 3/4 inch roman tub faucet.it is 2-3/8" long, 1" diameter at the threads into the valve body.'

Old cartridge wouldn't budge using 17mm socket turning counter-clockwise. Didn't want to force it. Any suggestions for removing the stuck one?

I had the exact same problem. I put the entire faucet on the bench vise. Clamped the old cartridge in the teeth and twisted the whole faucet around till it broke free. (Have a wall mounted faucet)

I ordered unit on amazon. It was too short and looks like it needs an extended control arm. How do I get the correct part number and order part?

Not sure I have the answer, but I have a bunch of these things in my plumbing and several of them (like in my shower--thalia handles) seem too short, but the extra length is supplied by the Grohe faucet handle. Exactly what kind of faucet are you replacing the cartridge on? I think Grohe makes only one cartridge length (but I could be mistaken).

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Specifications

Material	Ceramic
Brand	GROHE
Item dimensions L x W x H	0.01 x 1 x 1 inches
Exterior Finish	Chrome
Inlet Connection Type	Male Threaded
Outlet Connection Type	Male Threaded
Number of Ports	2
Outlet Connection Size	0.75 Inches
Specification Met	CE
Global Trade Identification Number	04005176189937
Manufacturer	Grohe
Part Number	45887000
Item Weight	4.2 ounces
Product Dimensions	0.01 x 1 x 1 inches
Item model number	45887000
Is Discontinued By Manufacturer	No
Size	Small
Color	StarLight Chrome
Style	Right Close Ceramic Cartridge
Finish	CHROME
Shape	Round
Installation Method	Wall Mounted
Item Package Quantity	1
Number of Handles	1
Included Components	Product Only
Batteries Included?	No
Batteries Required?	No
Warranty Description	“*1 year Limited warranty from date of purchase”

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