Hey guys, my coilovers arrived this morning

but before i fit them prob gunna wait till after xmas. I wanted to replace the top mounts and bearings but after ringing both GSF and VW i got two different prices.
GSF said it would be £8-9 per side inc VAT.
VW said it would be £23 per side exc VAT.
I know the GSF parts wont be OEM but when i asked they told me they are made to the exact same spec as the VW OEM parts which to my understanding would mean the quality of rubber would be the same?
So my question is which would you advise i buy guys? Unless you know of a better brand?