Will this work for a R 842 replacement head? Can't find one here. Thanks,

Yes it will. It says that it works with the R-842 shaver on the SP19's updated packaging. I added a picture of the newer packaging to Amazon. It also says this on Remington's official website.

can I use the titanium blades from the SP 19 on my R5150?

Remington SP-19 (replaces SP-16) Titanium Replacement foils and blades for Microflex models. See https://remington.shavers-and-parts.com/remington-shavers-sp-19-replacement-foils-and-blades.html By Earthdog on March 23, 2018

ASIN	B000F3VDAI
Battery Description	Rechargeable
Blade Material	Titanium
Brand	Remington
Colour	Black
Customer Reviews	4.3 out of 5 stars 845 Reviews
Global Trade Identification Number	00074590808698
Head Type	Rotary
Item Weight	0.02 Pounds
Manufacturer	9
Model number	SP 19
Number of Blades	2
Recommended Uses For Product	head
UPC	787734718141 074590808698

Remington SP 19 Titanium MicroFlex Replacement Heads and Cutters for Titanium Microflex Rotary Shavers, Models R-950, R-960, Black

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