Wanted 8372A Agnus chip and 5×44256 RAM chips

[Blizzard 128 MB]

Hello. I need 1×8372A Agnus chip and 5×44256 RAM chips.
I want to expand this motherboard onto 1 MB chipRAM:
http://amiga.resource.cx/photos/gallery/a500rev6a-2.jpg

[Blizzard 128 MB]

8371 Agnus 0,5 MB chipRAM max., 8372A 1 MB. I have to change the 8371 Agnus chip to 8372A.
Tested 0,5 MB RAM expansion 20-30 €, unreal, isn't worth it. The completed, tested A500+PSU+mouse = 30-35 €.

Real prices: 6 chips max. 10 € + insured shipping 7 € = max. 17 €. So more expensive, than would be needed.

The original rev. 6. motherboard on real price + expansion components  cost on real price = more expensive, than original rev. 8A 1 MB  motherboard on real price. I have to work on the extension yet.

I want to expand to 1 MB the rev. 6 motherboard cheaply.
I do not want to buy a rev. 8A 1 MB motherboard. Shipping cost high.

[Blizzard 128 MB]

I need a cheap 8372A chip. 10-15 € + shipping too expensive. I found 8 44256 RAM near.

[Blizzard 128 MB]

Which version PAL Agnus chips usable to the 1 MB chipRAM expansion?
http://www.bigbookofamigahardware.com/bboah/product.aspx?id=1478
2 MB 318069-18, 1 MB 318069-16, 2 MB 318069-10.
http://www.ebay.de/itm/Agnus-8375-1MB-fur-a500-2000-318069-16-/161859271010
Necessary any kind of modification on the rev. 6A motherboard?
I know this: http://s2.postimg.org/8o0x83w69/A500_6a_1_MBCHIP.png

[Blizzard 128 MB]

Look: http://www.amibay.com/showthread.php?73225-Agnus-8375-chips-Agnus-%281MB%29-%28318069-16%29-new
http://www.bigbookofamigahardware.com/bboah/product.aspx?id=1478
Agnus (1MB)             8372             318069-02             A500 (PAL), A2000 (PAL) Regular Type
A500, not A500+:
Agnus (1MB)             8375 / 8375 R1             318069-16             A500 (PAL), A2000 (PAL)
A500 = rev. 6 motherboard. A500+ = rev. 8.
Rev. 6 motherboard + 8375 318069-16 OK. Or not?

[Blizzard 128 MB]

https://en.wikipedia.org/wiki/MOS_Technology_Agnus
ECS Agnus which can address up to 1 MB of Chip RAM
8375 (318069-16 only) (PAL) - Amiga 500 from Rev 6 (PAL); Amiga 2000 model B from Rev 6.4 (PAL)

Rev. 6A 0,5 MB to 1 MB chipRAM:
Step 1. 4×44256 soldering (in socket).
Step 2. 8371 out, 8375 318069-16 in.
Step 3. 2 jumper modify:
http://s2.postimg.org/8o0x83w69/A500_6a_1_MBCHIP.png
Ready.
This OK? PAL system only.

[Blizzard 128 MB]

Read all of the topic.

[Blizzard 128 MB]

You cannot help. You do not have an idea of the asked things. I found about the internet what I wanted.